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hieu3011
2 năm trước
Bài 5: Một bể nước có hai vòi nước chảy vào. Vòi thứ nhất chảy riêng thì sau 2 giờ sẽ chảy đầy bể, vòi thứ hai chảy riêng sau 3 giờ thì sẽ đầy bể. Hỏi khi bể không có nước nếu cả hai vòi cùng chảy sau bao nhiêu sẽ đầy đầy bể ? Bài 6: Tỉ số của A và B là 2/5 . Nếu A gấp lên 2 lần và giữ nguyên B thì được tỉ số là bao nhiêu?
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