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Ngothanh1999
2 năm trước
Cho tam giác ABC vuông tại A. ( AB < AC) . Gọi M; N; P lần lượt là trung điểm BC, AB, AC. Trên tia đối MA lấy D sao cho MD = MA. a) CM: Tam giác BMA = Tam giác CMD b) CM: DC vuông góc AC c) Trên tia đối CD lấy E sao cho CE = NA. Lấy P CM: N, P, E thẳng hàng ( gợi ý cộng góc) d) CM: PN = 1/2 BC. ( gợi ý c/m NE = BC) Vẽ hình, chú thích đầy đủ và làm theo cách lớp 7 giúp mình nha
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