问题
解答题
一项工程，甲独做10天完成，乙独做15天完成．写出甲、乙工作效率的比，并化简．
答案
（1÷10）：（1÷15）
=
：1 10 1 15
=3：2
答：甲、乙工作效率的比是3：2．
搜题请搜索小程序“爱下问搜题”
一项工程，甲独做10天完成，乙独做15天完成．写出甲、乙工作效率的比，并化简．
（1÷10）：（1÷15）
=
：1 10 1 15
=3：2
答：甲、乙工作效率的比是3：2．
Life in the twenty-first century will be very 50 . Many changes will take place, but 51 will the changes be. The population is growing 52 . There will be many 53 in the world and most of them will live 54 than people in the twentieth century. Computers will be much smaller and 55 and there will be at least one in every 56 . And 57 studies will be one of the important subjects in school then. People will work 58 and they will have more free time for sports, watching TV and travelling. 59 will be much easier and cheaper. And many more people will go to 60 countries for holidays. There will be changes in our 61 , too. Maybe no one will eat meat every day, instead, they eat more fruit and vegetables. Maybe people will be 62 . Work in the future will be different, too. 63 and hard work can be done by robots. Because of this, 64 will not have enough work to do .This will be a problem.
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