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hoacucxanh68
2 năm trước
một căn phòng hình chữ nhật có chiều dài 6 m, chiều rộng 8 m . người ta muốn lát nền nhà bằng những viên gạch hình vuông cạnh 20 cm. tính số viên gạch cần để látnền nhà.
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