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2 năm trước
Có hai chiếc bánh ngọt hình khối lập phương. Biết rằng độ dài cạnh chiếc bánh thứ nhất gấp đôi độ dài cạnh chiếc bánh thứ hai. Hỏi thể tích chiếc bánh thứ nhât gấp bao nhiêu lần chiếc bánh thứ hai? A. 2 lần B. 4 lần C. 6 lần D. 8 lần Bạn An cần trang trí một bức tường hình chữ nhật có chiều dài là 5m, chiều rộng là 3,8m bằng cách dán các tờ giấy hình vuông có độ dài mỗi cạnh là 0,5m. Khi dán, mỗi tờ giấy đều sát tường hoặc còn thiếu sẽ được cắt vừa đủ từ một tờ giấy. Tính số tờ giấy cần ít nhất để dán phòng? A. 80 B. 76 C. 70 D. 72
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