第1个回答 2016-01-24
如图所示，能不能再简单一点？Separable Equation而已
大神，我有几道题没人会，可以帮忙答一下吗？
追答追问这里发过来吧
追问A tank initially contains 200 gallons of water. Then at time t = 0 brine containing 5 pounds of salt per gallon of brine is allowed to enter the tank at a rate of 20 gallons per minute and the mixed solution is drained from the tank at the rate of 25 gallons per minute. How much salt is in the tank after 30 minutes?
我也在找人翻译。。。十分不好意思。。。跪谢！！
追答额，其实我也擅长英语的，只是应用题太久没有接触了
追问大神你。。。跪求啊。。。
追答
第2个回答 2016-01-24
这道题求啥