The maths problem is not easy to work out.怎么不可以用is not easy to be worked
问题描述：
The maths problem is not easy to work out.怎么不可以用is not easy to be worked
答
这句话写成it is not easy to work out the maths problem.就容易理解了.原句强调数学问题,省略了主语人,问题做work out 的宾语
work和work out的意思不同,