来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/08/05 17:41:29
分式的加减3题,如下图,
![](http://img.wesiedu.com/upload/a/fa/afae6095dfbb95434ff3e147bf05edb9.jpg)
1/(a-1)-2/(1-a²)=1/(a-1)+2/[(a+1)(a-1)]=(a+1+2)/[(a+1)(a-1)]=(a+3)/[(a+1)(a-1)]
1/(2-a)-a-2=1/(2-a)-(2+a)=(1-4+a²)/(2-a)=(a²-3)/(2-a)
3. 1/(ab-b)+2/(a²-1)=1/[b(a-1)]+2/[(a+1)(a-1)]=(a+1+2b)/[(a+1)(a-1)]=(a+2b+1)/[(a+1)(a-1)]