题目

解方程：   答案：两边同乘以（x+1）(x-1)得：x-1+2(x+1)=4                                    3x=3                                     x=1…………4分     经检验x=1是增根。故无解。…………5分解析:先求解，后验根。 (用所给单词的适当形式填空)It's not good for us ________(read) in the sun.