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nampp20
2 năm trước
cho hình chữ nhật abcd có cạnh ab=9cm,dộ dài cạnh bc bằng 2/3 độ dài cạnh ab a,tính diện tích hình chữ nhật abcd b,trên ab lấy điểm m,bd cắt mc tại k ,so sánh diện tích tam giác bck và diện tích tam giác dmk
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