小明打开注水管,向容量为350升的空池注水,每分钟向池内注水15升,由于没有关好排水管,每分钟排水2升,5分钟后,小明将排水管关好,将空池注满一共需要多少分钟?
(1)
5+(350-(15-2)x5)÷du15
=5+(350-13x5)÷15
=5+(350-65)÷15
=5+285÷15
=5+19
=24
(2)
(350+2x5)÷15
=(350+10)÷15
=360÷15
=24
暂无解析
I'm eleven years old. My little sister is nine. So __?