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jixjang1.3
2 năm trước
cho tam giác abc m n lần lượt là trung điểm ab ac đường thẳng b song song với ac cắt bm tại d a chứng minh rằng bd =an b) chứng minh rằng N là trung điểm ac giúp em ạ, em cảm ơn nhiều ạ!
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