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Mymy23
2 năm trước
Hai vòi nước cùng lúc chảy vào một bể không có nước thì sau 3h20p bể đầy. Người ta cho vòi thứ nhất chảy trong 3h, vòi thứ hai chảy trong 2h thì cả 2 vòi chảy được 4/5 bể. Tính thời gian mỗi vòi chảy một mình đầy bể.(Giải bằng cách lập PT hoặc hệ PT) Giúp mình nhanh nha
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