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loga2022linh
2 năm trước
cho hình chữ nhật ABCD biết AB bằng 36cm, BC bằng 20cm E là điểm chính giữa của cạnh AB nối E với C. a) Tính diện tích hình thang AECD. b) Nối A với C hình bên có mấy tam giác. Tính diện tích của tứ giác AECD và diện tích hình tam giác AEC.
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