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hungazpk123
2 năm trước
Cho hình thang ABCD (AB//CD), có hai đường chéo vuông góc với nhau. Vẽ đường cao BH và hình bình hành ABEC. CHo biết BD=12cm; DH=7,2cm. Hãy tính: a) Độ dài DE. b) Diện tích ABCD
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