因式分解的题目:先化简,再求值:(x²+2x+1/x²-1)/(x²+x)/x-1,其中x=2
问题描述:
因式分解的题目:先化简,再求值:(x²+2x+1/x²-1)/(x²+x)/x-1,其中x=2
题上
答
[(x²+2x+1/x²-1)]/[(x²+x)/x-1]
=[(x+1)²/(x+1)(x-1)]×[(x-1)/x(x+1)]
=[(x+1)/(x-1)]×[(x-1)/x(x+1)]
=1/x
x=2
原式=1/2