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huadung1991
2 năm trước
Điện tích 1 tấm bảng hình chữ nhật là 3,575m2,chiều rộng của tấm bảng là130cm. Người ta muốn nẹp xung quanh tấm bảng đó bằng khung nhôm. Hỏi khung nhôm đó dài dài bao nhiêu m ???
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