Cho hình chữ nhật ABCD có DC = 20 cm, BC = 15 cm và điểm M là trung điểm của cạnh AB.Đoạn thẳng DB cắt đoạn thẳng MC tại điểm O.Tính: a)Diện tích hình thang AMCD. b)Tỉ số của diện tích tam giác DBC và diện tích hình thang AMCD c)Diện tích tam giác DOC.

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