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thoconhappy6
2 năm trước
giúp mình với cho tam giác ABC có đường cao AH và AM là trung tuyến tam giác AHC , BN là trung tuyến tam giác ABN . hỏi tam giác ABC cần điều kiện gì để AM vuông góc BN . vẽ giúp mình cái hình nha
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