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tminhduc069
2 năm trước
cho hình thang ABCD a, tính chiều cao hình thang biết diện tích hình thang là 36 cm2 đáy AB bằng 2/3 đáy CD , CD= 60cm b, cho M là trung điểm cạnh AD . so sánh diện tích ABM và diện tích ABC
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