The studients found ____ easy to work out this math problem

The studients found ____ easy to work out this math problem This is very easy to work out the math problem.有什么错? I found()impossble for()to work out the math problem I found it easy (to work) out the problem in this way. 括号内为什 I found ___ not easy to work out the problem, ---This Math problem isn’t easy for Jack to work out, is it? Betty found _____ work out the math problem. The math problem isn't easy for me to work out (保持原句意思) 一道英语填空All of us found difficult to work out the math problem 是用动名词还是动词不定式working(to work) out the math problem like this The problem is ____ easy for me ___ work out.A.too,to B.engo This physics problem is__ easy for the students to work out.