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ngiang469
2 năm trước
Bài 1 (1,5 điểm). Tính bằng cách thuận tiện nhất: : 0,25 - : 0,125 + : 0,5 - : 0,0625 Bài 2 (1,5 điểm). Tìm y biết : y + y x + y : = 252 Bài 3 (1,5 điểm). Trên quãng đường từ Bình Dương đến Vũng Tàu, một xe máy đi với vận tốc 40km/giờ trong 3 giờ. Hỏi cũng quãng đường đó, một ô tô đi với vận tốc 60km/giờ mất bao lâu? Bài 4 (1,5 điểm). Một bánh xe có đường kính là 6,5 dm.Hỏi bánh xe đó phải lăn bao nhiêu vòng đế đi được quãng đường dài 2041m.
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