Nếu bể không có nước người ta mở vòi 1sau 5 giờ sẽ đầy .Nếu bể không có nước người ta mở vòi 2 thì sau 9 giờ sẽ đầy bể .Khi bể ko có nước người ta mở vòi 1 trong 2 giờ đầu rồi sau đó mở tiếp vòi 2 cùng chảy .Hỏi 2 vòi cùng chảy đầy trong bao lâu?
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22 tháng 10 2017
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28 tháng 9 2018
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11 tháng 3 2017
ta sẽ có số giờ đầy bể là:
5x2x2=20
đáp số:20
21 tháng 1 2016
1h voi thu mhat chay 1/6bể voi thu 2 chay 1/9 bể sau khi voi 1 chay 1h thi bể nuoc cần chay thêm: 1-1/6=5/6bể
theo bai ra ta co: (1/6+1/9)t = 5/6 => t = 3h
đáp số: 3h
(bai nay khó chỉ có bạn gioi toan moi hieu )
17 giờ 30 phút nha:))