题目

先化简再求值:(x-1分之x的平方-x+1)除以1-x分之4x的平方-4x+1,其中x满足x的平方+x-2=0

提问时间：2020-07-27

答案

x²+x-2=0(x-1)(x+2)=0x=1或x=-2(x²-x+1)/(x-1)÷(4x²-4x+1)/(1-x)=(x²-x+1)/(x-1)*(1-x)/(4x²-4x+1)=-(x²-x+1)/(4x²-4x+1)=-(x²-x+1)/(2x-1)²当x=1时(x²-x+1)/(x...