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2022-11-20 20:29:25
2022-11-20 20:27:47
một giờ vòi chảy vào bể : 27,5*60=1650(l)
3/5 giờ vòi chảy vào bể : 1650*3/5=990(l)
Đáp số 990 l nước
2022-02-10 20:58:34
2022-02-10 20:58:34
2022-02-10 20:58:34
2022-02-10 20:57:40
2022-02-10 20:57:40
2022-02-10 20:57:40
2022-02-10 20:50:14
2022-02-10 20:46:52