使式子4x-1/(x+2)(x-1)=k/x+2-(1/1-x)成立?若存在请求出k值
问题描述:
使式子4x-1/(x+2)(x-1)=k/x+2-(1/1-x)成立?若存在请求出k值
答
4x-1/(x+2)(x-1)=k/x+2-(1/1-x)=[K(X-1)+X+2]/(x+2)(x-1)
=[(K+1)X-K+2]/(x+2)(x-1)
故K+1=4,-K+2=-1
得K=3
存在,k值=3