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dothithuhangkhongyeucau2701
2 năm trước
cho hình thang ABCD(AB//CD) có AB<CD đường chéo DB vuông góc với cạnh bên BC kẽ H là đường cao của hình thang Chứng minh ΔCBD đồng dạng ΔCHB giúp me với mai thi rồi ai nhanh nhất cho 5*+tlhn
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