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yukimi10x
2 năm trước
Bài 4. Cho một tấm bìa hình chữ nhật, dọc theo chiều rộng, người ta kẻ một đường thăng chia tấm bìa đó thành 2 hình: Một hình vuông và một hình chữ nhật có chiều dài gấp ba lần chiều rộng. Hãy so sánh hình vuông với hình chữ nhật ban đầu ? Bài 5: Mua 1 kg đường hết 9000 đồng, bán 1 kg đường được 10800 đồng. Tính tiền lãi so với tiền vốn là bao nhiêu phần trăm?
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