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huynhanh9867
2 năm trước
Bài IV. (3,5 điểm). Cho tam giác ABC có ba góc nhọn, hai đường cao BM, CN cắt nhau tại H. 1) Chứng minh tam giác HNB đồng dạng với tam giác HMC giúp e vs ạ em sẽ thả sao
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