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sonle8279
2 năm trước
Bài 3: ( 2 điểm): Cho hình thang vuông ABCD, biết AD = 30 dm, BC = 45 dm, AB = 47 dm. Điểm M là trung điểm của cạnh AB. a) Tính diện tích của hình thang ABCD. b) Tính diện tích của hình tam giác AMD. c) Tính diện tích của hình tam giác MCD.
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