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vananhluong296123
2 năm trước
Một phòng học nền nhà hình chữ nhật chiều dài 9m , chiều roongj6m . người ta muốn lát nền bằng cùng 1 loại gạch như thế nào trong hai loại sau : 40 cm x 40 cm hay 50cm x 50 cm ( các viên gchj lát liền nhau và ko cắt viên nào ) . Khi đó người ta cần mua bao nhiêu viên gạch giúp , cần gấp
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