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

This maths problem is____________ and I can do it_____________ . I spent two hours on this maths problem这句话里on this maths problem做什么成分 I spent two hours on this maths problem.maths 应该错了吧 If you help me,I can work out this maths problem改为if条件状语从句———,I can work out this maths problem This Maths problem is difficult.I can't work it out.的同义句This Maths problem isn't ______ ______ ______ ______ to work out. __ __ THIS MATHS PROBLEM IS ! It is difficult () out this maths problem this maths problem.为什么加s 定语从句改错：This is the most difficult maths problem which I have done. This maths problem is not easy.I can't work it out.RT I can’t work out this maths problem,it goes b______my ability. Can you work out this maths problem?同义句___you___ ___ work out this maths problem? this maths problem.为什么加s this是单数啊 I found it impossible to work out this maths problem 不加be动词也对么/?为什么 is this maths problem 要用easy还是easily 29.Finally,she worked out this Maths problem.(同义句) To work out this maths problem is difficult.(同义句转换) __difficult __ work out this maths problem To finish this maths problem is difficult(改成同义句） （）（）（） finish this maths problem