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loga1501
2 năm trước
Cho hình chữ nhật ABCD . Kẻ AH vuông góc BD(H thuộc BD ). Gọi M , N , I lần lượt là trung điểm của AH , DH và BC. Chứng minh a) BMNC là hình thang; b) BMNI là hình bình hành; c) AN vuông góc IN(Trình bày đầy đủ hộ mik nhé camon ak)
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