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HuyPhan
2 năm trước
5. Một đám đất hình chữ nhật có chiều dài 17,5 m, chiều rộng bằng chiều dài a. Người ta đã dành 40 diện tích đám đất đ để trồng hoa. Hỏi diện tích trồng hoa là bao nhiêu mét héc-ta ? b. Xun quanh đám đất n ười ta cắm các cọc để làm hàng rào. Tính số cọc cần mua, biết khoảng cách giữa hai cọc là 1,75m.
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