分子里有字母怎么化简.像（kx-1）/（x-1）怎么化成k+(k+1)/(x-1)...还有(x+2)/(x-1)怎么变成1+3/(x-1)...方法.

Question

分子里有字母怎么化简.
像（kx-1）/（x-1）怎么化成k+(k+1)/(x-1)...还有(x+2)/(x-1)怎么变成1+3/(x-1)...方法.

Answer 1

解:(kx-1)/ (x＋1)=(kx-k＋k＋1)/(x-1)=k(x-1)/(x-1)＋(k＋1)/(x＋1)=k＋(k＋1)/(x＋1).(x＋2)/(x-1)=(x-1＋3)/(x-1)=(x-1)/(x-1)＋3/(x-1)=1＋3/(x-1)