[5(X-1)+9]/x-1 =5+[9/X-1]
问题描述:
[5(X-1)+9]/x-1 =5+[9/X-1]
5(X-1)+9/x-1怎么变成5+[9/X-1]的?5(X-1)是怎么消失的?
答
5(x-1)+9/x-1=5(x-1)/x-1+9/x-1=
5+[9/X-1]