![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcugK5n0W6OM3I4wunawm0xGdzRdA0bECc9JZvJ49h_V8VdIrVlOD28BrcHvBEKUwgaJP2PHVtOYPJpfMFUGj5-bOZJ3Tvuu4pn46nbQ1bo23zMD99uH3pdRjVmHEi8Z87Qdp7aE4HCFY/s0/1.jpg)
B1. Dấu + cho mặt đầu tiên
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhotbrPlnfG0eyLxpeuxuTBbS7A8_nE0EUPCpbvwFDUuHKQnolqp7MCORi3D02muvqTm5YdJoj4jMikX2zevd7XgMsAywZrJha1d72vd_XHaQSHjwwi2vOw73etACQcp54IvrATJVRRTLA/w200-h148/0.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmbcys7Whlk6AQ3Mor83x8Ms86wKJ35CpRAYUX-HIo74GD3euxJ2DL37WvdpZGNHcH1eW2VZ8hTc-NnGUicSAqie_lFHVhO6o8YT_4SGOYunwCoFL9-4pLHpxD67t6_75Us2d4iNScxqs/w200-h151/3a.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQ72BmTevlK_Xkm6xmhetEQ7tzOUmjOPta6XSGx6x-rdFDRnQW_V4xjCFWWTMg1QbFfHtPZ_v6Cc1DYQ9fI-dv9v8u2rSm8GY8bUAhjqJAeG-9oaWHJn4Q2sty0coGPVyMKPZ1L8_0Wts/w200-h148/3b.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWxEcXjIxWxxZZ07vF8xPvipkEYvYxt5Giy77xsfewBVJ_0VQRjC_RJgarNyOZh_d9A1RA6WlA3pxchRSncgbxJChadDhBhjlqi63wN_YxGnlldYSI4NhMWahyGmE3AN3ep6QchZRyj_w/w200-h151/2a.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqwaH5CYUJdkvV3wQ87BqnV7wQ1YnM8ZWMY7O14U5voLt3wVl9ZYsvaxaGHvBsuxOyVJuPJDIV7y7R2vkz-p78ou82K69boSVSMGgxXzzcaBOJyV9wbT1g9CIDEjU6m8vT-bhtGwQY3Ko/w200-h158/2b.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwncho3Rm8KHF6BiJ8MFzQnnY4UvrSHn0JgVR4w9hUQbBV7u6oUKqoLLJUgzPk2WKlPyg2nkFLiYOk9seUrOBDU41Gjrx1-0laINdrEQSwAA7H7SGBjnI5CiPExsPoVxYyasYbnBXpT5M/s0/L2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGbNcZZPa1Q3tLWepJxhDb1VrOUfJ_6AGXyc-SuVUSeG8xZqGgP8Qw2FyO-0UloqXM9XI3L04jsrp7nAMJwtQx4bZchQa1aJSywd98PbjchQ7iw-80nj1A33bHsyzmV5dLPip8TOYJ5xk/w200-h160/3.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicaeJf7bg9Wve6UEvMk84aaGoOnvBMVYB9OebPTDwEMofpa9oZe1-sg7Pw8ssnsMCx3vcvXVKuLK2BlPKnlOsPE3ygRd_JbwV9Ti_3qKd9prxk2I6N870C8egP7ErTB3B2CmPXVBg53qY/s0/F1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicprvUqUsHGBWgNDpXiH1CJ0gTZmkeFbI1tep77TJyHPbUEJIurx54ZwlApmCmoFKpHUWVePtRR1dSRW_eova2SbjbJIkgt5YqTs6pSPranjNnbondxTMmvIoMDTErSfbIgL2Y5VQdf1M/w200-h159/4.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhswC1X-mkZP8TIKXjYrdURLEQP0XQSOFc_9gClddsOL81k5Ziau6Z0myGky8pe93EfBWtxPOqVh_XW1YSjceKxtseUiUd-3ifa9LZ5hcD2llKQmo92f8b28bhZwWrrKif4szA47Pt-RIY/s0/F2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwncho3Rm8KHF6BiJ8MFzQnnY4UvrSHn0JgVR4w9hUQbBV7u6oUKqoLLJUgzPk2WKlPyg2nkFLiYOk9seUrOBDU41Gjrx1-0laINdrEQSwAA7H7SGBjnI5CiPExsPoVxYyasYbnBXpT5M/s0/L2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjx4-ChP0nRF20oNDj-te-kp1bmZH6Bq02jhnCkUZXYkqbmfm4fXvKHDqI9djPV_o2xLetfh84_AZiggdUHs4qtoErYE2cjDeHw8dnzbD2HgEOQARIlL9J6c6gbIHieH3yTXuo5Oq6eg3M/w200-h166/6.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicaeJf7bg9Wve6UEvMk84aaGoOnvBMVYB9OebPTDwEMofpa9oZe1-sg7Pw8ssnsMCx3vcvXVKuLK2BlPKnlOsPE3ygRd_JbwV9Ti_3qKd9prxk2I6N870C8egP7ErTB3B2CmPXVBg53qY/s0/F1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicaeJf7bg9Wve6UEvMk84aaGoOnvBMVYB9OebPTDwEMofpa9oZe1-sg7Pw8ssnsMCx3vcvXVKuLK2BlPKnlOsPE3ygRd_JbwV9Ti_3qKd9prxk2I6N870C8egP7ErTB3B2CmPXVBg53qY/s0/F1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbaZDoBxSdjhqVbVkqry5DxjXJH7PUBXqOWSQ3TTs9nTGPWzygWeNCZksC51GJW07CsYDDbNz10jazV0kTwZiWSSkxnPAlgcpdkFBKfQJQBmWv83bKZhrb25ocLpy4f60G0NUgR1ejU3w/w200-h154/7.png)
B2. DẤU + CHO MẶT ĐẦU TIÊN
Và khớp với tâm bên dưới
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipaOEUvKUOB-xTFpN2EWVWcOVDT3Nu56H7bknxeTnAkqWa_GQ-tNlGbK0hQvOdUDABGQ9XH2F4zugDbjNXw7fLzIBuHwxfJ5CKSs7uKcxaOON2R3Dh9F45DymxjhVW65tZURgRP9wxrSk/w320-h253/8.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizcgiL8Gi0dKirUqy9RXDvaEtrpaaT5dfRjsn_2scvy8ttyrKxtvYphFW0cNX-FRiAPdIRUoCT_PJBRVO6_zvJocbAIpr8UbHRvJN1MHfFTNsBpezcWrrC5sg1lEKmX_AhBF9j1jpt_Vk/w320-h274/9.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4VFgEMch5h392mTJUsOyxxS-u8jaDt139o94DtldrTYTenM_a4j0gOhf0fQ6TJK_cVgbDOmZoA8ZWm1VA2r5qlDFRAFIfFKP-vbL1N1H6Q0A8Jx5WqFMe6NfYhlx2agWOiBH0puF4YD4/s0/10.png)
B3. HOÀN THIỆN CÁC GÓC CHO MẶT ĐẦU TIÊN
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijTppYEn8Jnd7Ehh41BtKQwW88OEfRoKusCNkULwyCQajhtRadqUMS_l73wVK19IFhNZhglbkB63T7hvii0iKSVGh8iMuMRcR9ApOaWHV0ZhDEvgCwcVSe3EI0G9t1HLXzvuJQiGau61Q/w200-h184/10.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjz4JnZ121-khTK9IL1Gcn9Cetkz899oE-y73UFixA02CWsapTLXwxm29HL7ER8TaFF42KLstS858IJYrTxqTThJ6iiStNQ7d-vXdqFPfYYFy9RIG4H6vExHPMegK85grA_z4s30F_yDqc/w200-h151/11.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2pTc4VB-d1TPT8wYM1zE4R1X-S9LgSm23SYl91fphVbkEMJ_iCPl6hu-DI9jCLVCvs4xQ84qwQSVsXOKClxhdzOCDs9l8LMLpUTE_mEoO4-S8lpTUCYAH9ZQ6eErDJH8lMTM_zmvspxI/s0/L1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwncho3Rm8KHF6BiJ8MFzQnnY4UvrSHn0JgVR4w9hUQbBV7u6oUKqoLLJUgzPk2WKlPyg2nkFLiYOk9seUrOBDU41Gjrx1-0laINdrEQSwAA7H7SGBjnI5CiPExsPoVxYyasYbnBXpT5M/s0/L2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjg1eXAIjxkNMz03PTzvt1UCan8AKMjdpNyQM6dtSZVDxLyYd9c6UKvnQU9NXQFUc9ISf4PmhD8diM7D5dwuhI0OQwwEoWdngv1N_Vx9aH7Rx3EUT6JRTxAEQW3-4X08s4s-TraM9AwVzw/w200-h165/12.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLnIw7rH9TzKqO7R8z17Kou10we8ACoJZA0BCK__zY73FvAEZi71VXV3KQg3qrrz9lj1KGm99SDT__SEY3jU-VKwvhRIqzNV22vJFJcGY0-YfSCjLwDY2i5CCUcThlpfoO54PKoPTwScM/w200-h161/13.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2pTc4VB-d1TPT8wYM1zE4R1X-S9LgSm23SYl91fphVbkEMJ_iCPl6hu-DI9jCLVCvs4xQ84qwQSVsXOKClxhdzOCDs9l8LMLpUTE_mEoO4-S8lpTUCYAH9ZQ6eErDJH8lMTM_zmvspxI/s0/L1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwncho3Rm8KHF6BiJ8MFzQnnY4UvrSHn0JgVR4w9hUQbBV7u6oUKqoLLJUgzPk2WKlPyg2nkFLiYOk9seUrOBDU41Gjrx1-0laINdrEQSwAA7H7SGBjnI5CiPExsPoVxYyasYbnBXpT5M/s0/L2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjknoOMpiOdWV-5kNYjj8r34j9d9pv8b9HdciBwHsGrEgebAhORKXW7bpYbF6QOYTSOV1nNs_Y9P7lFd_tAfOSdUbkTNA2NYHY7emN__PHKaMLReC5kOC9MXjGM1EPHcQy_8cKjlOX3d0/s320/14.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiue2B2sFfVZzIn5AyV-Px5zeXkNL-PexM37xF73evCt2ieOQk5G2pF5pGDkEga8_ZJUEC_2fLBiqsGLJIBCxxD12_mDweYo_NYuqQ-v8yLxQjGwvE5wIAA-capyNTqTY0VFfkJ4Ddzwks/s320/14.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2pTc4VB-d1TPT8wYM1zE4R1X-S9LgSm23SYl91fphVbkEMJ_iCPl6hu-DI9jCLVCvs4xQ84qwQSVsXOKClxhdzOCDs9l8LMLpUTE_mEoO4-S8lpTUCYAH9ZQ6eErDJH8lMTM_zmvspxI/s0/L1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdR-qieNhhgg9elbZe_1Xo7CdQmC4JApE8DmseEe47HIgyc77BVmAVLRKAu32swpRQilWqkZcG-KyVIQL97HY3_p2lAkVKqyowWpmpj4FWkTju3T6LGXXmdbIrdAk_ye07UNKwYD5hIXc/s0/D2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwncho3Rm8KHF6BiJ8MFzQnnY4UvrSHn0JgVR4w9hUQbBV7u6oUKqoLLJUgzPk2WKlPyg2nkFLiYOk9seUrOBDU41Gjrx1-0laINdrEQSwAA7H7SGBjnI5CiPExsPoVxYyasYbnBXpT5M/s0/L2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2dHn4sDuiq7EaVk17uHA2CH4X1sK0HD4JkndNw6JcaKA23PnG30nWzsTAKY5aWlD50SjK8QE-1_qtvL6O-f54FTi5rt91eG1A29Phw8FCjnbGx5stNGHSHG8rJlVkmzac_KNLk6ascM/s0/D1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieBSXIgwsocntKrLzqo840j0yG-JRgZBm-DpEfEfrLCpHFBhcfvcOpYDikYpHr6BJ5CdF8v682g05XljiXvxOHP8JgSSrwJKZtdpsYWkux0vfyYwfxu5gh9EmTL0EyKYW2foQNCfL08GY/s0/36.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixhrTZvQcoVylFEAGz9eeDU-yjrlSh-EdC7y58XFt0pIGygXGeZowhAgqkeH_DlwZFw5WwqEwB-4TLARwkr6ukP7kWWzODBQ29J49xswjNAeJcd5Da7zXkZgbZIQZ9Wb29qL_B4I9HjcMk/s16000/giai-khoi-rubik-4.jpg)
Khi không có miếng cạnh nào để chèn vào tầng giữa, bạn sẽ phải thực hiện thuật toán trên hai lần để đánh bật miếng ghép ra ở bước đầu tiên.
1. DẤU + CHO MẶT trên
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJCBsAoPjdNEb63JoldB3r3b8lzVYByWYnDwAgmExy7s0kPsLcCUJBSf0lsX1CZRKljkFJfbXj2jQSz9P8ToCJJU9vXBQPYvNiG7NsU-zBxVrJ4uhWdfRf3aZl7zXIs0P4fxu7jAwnQjA/s0/45.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBmMqCeWrZMmesKFl0jCY_TWxK7BaOHsdBY5VnTe4PqKv4AhYRvF42whq-9CIZXddolSfPEfJCH7XtXQ3h_WE26fj0GxHoAu2ZgRF_IB9tCwPhF-ML1GEjjO68WeQRyZrJNh3lHd7Bfp4/s0/46.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiivoL_8rCQEzSh-I_t6JPp6elya9XlZ30oz6kkDPgOzKDcN8ii8aqycC0ql1b9B9cRvTLPrvphn3RMu2jdtKNwlfNCu58LSyhFLlAcFX8vCk4dmgnSI__p4JmlIWhxpz-rGiL99mQ3OTs/s0/47.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXVTtlRuN-LGqbxxSM8Jf2Hc0Wf-LZiyiwXP8PLDSQNO_J8DBST6QJDgOu5DpWO6rFyzi4eRWQGFvnkEiFaNd4znHkkBvQAnNpL6danIhH7adZBuMmgXepTWdY0M9orwnbz2dJFNqTPVM/s0/48.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGg32V4gB2gLNKD-0uE9ADW88oliRta4b9L2GwhyEhcYQFEzysQKopO6S-SOReloJLeefU2I2x7rlVMaHdt4eguKmf4RVrcKir4bN9aQ8SWmPy6HGiEyLzJ_Qqu_t7-1IIVD47pjdL1ZU/s0/49.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJCBsAoPjdNEb63JoldB3r3b8lzVYByWYnDwAgmExy7s0kPsLcCUJBSf0lsX1CZRKljkFJfbXj2jQSz9P8ToCJJU9vXBQPYvNiG7NsU-zBxVrJ4uhWdfRf3aZl7zXIs0P4fxu7jAwnQjA/s0/45.png)
Bước 2 : Định hướng góc
Mục đích của bước này là đưa toàn bộ mặt U về đúng màu (màu vàng).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWrg_pAjQImdXRQLWQoZkjRsTT0evVYkO8mU6yhJETrnZ6UizJbFh8B5aYDZ6DEMVcDxs2-FvwLmaO7fEskSBnLrHAX6W60qDMkgLMSnE5q6ButIlH-fsF3F0gOLBIi4dQ7t-Z_mJ56IkP3S47DfTvcayK-WVhsVgUvQ-4xpVJ_Qv6quLXtJtxNQuS/s1600/step6%20(1).png)
Có tất cả 7 trường hợp cần giải quyết. Khi làm công thức dưới đây, tầng 3 sẽ biến đổi như hình minh họa. Chú ý hình minh họa bên dưới thể hiện góc nhìn từ trên xuống, khi làm công thức ta vẫn phải giữ khối rubik sao cho mặt vàng nằm ở trên cùng.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrA1jyuQIV0Sn9QURI8FC6rDt-q8AXrgQp9Z0pgGmMCIEGyaU_1sR1Z4kujuhSxZbuWw27WaCTWM5Rx8r33U4jIuh9F1VJg4k_t4OM8sOBUfpXy8meBO3DGxlp7rmVMK5cXtSAY8Kab0NOxMMrMWHB8Ss80eeqfA2-xalDlezC0Btcuc7hNNB_gGCk/s16000/rubik%20ocean%2010.jpg)
Mục đích của bước này là đưa các viên góc về đúng vị trí của nó. Công thức dưới đây sẽ hoán đổi vị trí của 2 viên góc như hình minh họa. Để đưa cả 4 viên góc về đúng vị trí, ta có thể phải làm công thức này 2 lần.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKbj2Hiw3xMU3hoERZD7JcfPQfSYBG5rdExllyNjeccVQhSNEMibUUTG5X2wAOrcVZ3hoxnv2ayJ7dWEpzwOWDDtlXWmsvS4khs0wZUm793-wLaRMQxJjp0FuNGoLsBUviSPWmxJjc8HZjLmGDeoaD8OTw_IX39QsUnjSADs-POehtZsQnUy1dAsSa/s1600/rubik%20ocean%2011.jpg)
Công thức: (R U R' F') (R U R' U') (R' F) (R2 U') (R' U')
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhswC1X-mkZP8TIKXjYrdURLEQP0XQSOFc_9gClddsOL81k5Ziau6Z0myGky8pe93EfBWtxPOqVh_XW1YSjceKxtseUiUd-3ifa9LZ5hcD2llKQmo92f8b28bhZwWrrKif4szA47Pt-RIY/s0/F2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicaeJf7bg9Wve6UEvMk84aaGoOnvBMVYB9OebPTDwEMofpa9oZe1-sg7Pw8ssnsMCx3vcvXVKuLK2BlPKnlOsPE3ygRd_JbwV9Ti_3qKd9prxk2I6N870C8egP7ErTB3B2CmPXVBg53qY/s0/F1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn-zkS47yjRWnUwzHNwDQQqf_RwNvha6VG-13myxt6znM8JETpJB98vYQshBt7oEatPeQVj3SDT9bfwG9P8uZqVN3Ds5wkoIXgj-kLIdb0-F6eFVmksjmrTFyX2a4n14IU5sRjhuYORFU/s0/R2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
Bước 4 : Hoán vị cạnh
Đây là bước cuối cùng, 2 công thức dưới đây sẽ hoán đổi vị trí của 3 viên cạnh như hình minh họa.
Để đưa 4 viên cạnh về đúng vị trí, ta có thể phải làm các công thức đó 2 lần. Lưu ý ta có thể chỉ cần nhớ 1 trong 2 công thức là có thể hoàn thành bước này, tuy nhiên khi đó thời gian làm sẽ lâu hơn.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitrnoDeekAcXf6va-QdOrFEsmUf2G2w6cp2bGB3uPdbOiQcRqIQnWeM4NjyIKqH6dMmxBvLO13UztEj9AxjbXA63KrE6LsXmiOxlQqy9KSEbxheJ8xDIIZ59chT4pzN5b_so-HvFtNVStjtQhSCJx1pnxi8vcjq4ABWJCkMXPAjWRSzRPqn3qAa9qM/s1600/rubik%20ocean%2012a.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguLHzrL5uYUaTlyoUlwhLiYVD85QzjT_dzhANYjojPpGwB3w5utPluX4ZLdAgHoxby6Q-hbiDOjOOHvhb2lH1YnT8-zlsDBlIxqbzS4FZPLdPZ9wLEKhQQqPPNhgAgT8dWcWbLd0oyIKY/s0/U2.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhU5Btrzc33hrx3xuZfrFM_Iq91hteyVc7Y0EckahTTrJLwpaFLzDXAd9GspKsCJrRKZBl48SCEAR-gyU6UhqdA5_SgEQ_61cpO9jB9uh6xRroZwqJA5oSBXVvLemifzMf34SUkZ4Hlz0/s0/U1.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvLH_1_DKhOzeEcLOtYwWUigQUBZmLiM21U3yTW5NiaGewus0B0M6gkVo101s_OgKlnKG7520U2M3k6PYgd-LmUBLs0jk71mH9bIBdTyOQYR1mnS4Vxpbm-iO2wiPyoj667Pxcob-DAQo/s0/R1.png)
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