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i.hai.l.yen.u.33
2 năm trước
một mảnh vườn hình chữ nhật có chiều rộng 20m biết 2 lần chiều dài bằng 4 lần chiều rộng .Xung quanh mảnh vườn đó ngừi ta trồng cam ,cứ cách 4m trồng 1 cây .hỏi xung quanh mảnh vườn đó người ta trồng được bao nhiêu cây cam ?
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