This maths problem is easy (to work out ) 在这里不是被动用法吗?为何不用 to

This maths problem is easy (to work out ) 在这里不是被动用法吗?为何不用 to This maths problem is easy to work out.同义句This maths problem The maths problem is not easy to work out.怎么不可以用is not easy The maths problem is not easy enough for him to 是work out还是w To work out this maths problem is difficult.(同义句转换) __diffic This maths problem is a bit difficult fot me to work out. This maths problem is not easy.I can't work it out. This is very easy to work out the math problem.有什么错? ---This Math problem isn’t easy for Jack to work out, is it? this is a problem easy enough to work out in two minutes是什么意 This Physics problem is easy enough for us to work it out e_ 1.It is not easy to work out the problem.(改为同义句) To work out