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cuong27072003
2 năm trước
Cho hình thang cân ABCD có đáy lớn AB= 30cm, đáy nhỏ CD=10cm, góc Â= 60độ a) tính cạnh BC b)Gọi M,N lần lượt là trung điểm của AB và CD. Tính MN
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