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Cho hình chữ nhật ABCD có S=48cm2. Trên cạnh CD lấy điểm E sao cho EC=1/2 ED. Trên cạnh BC lấy điểm M sao cho BM=2/5 BC. hỏi a, Tính S tam giác AMB b, Tính tỉ số diện tích của hai tam giác ABM và CEM c, Tính S tam giác AEM
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