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先化简再求值(x^2/x-1-x+1)/4x^2-4x+1/1-x,其中x^2=1
人气:480 ℃ 时间:2020-04-23 13:04:53
解答
=(x²-x²+x+x-1)/(x-1)×(1-x)/(2x-1)²
=(2x-1)/(x-1)×[-(x-1)/(2x-1)²]
=-1/(2x-1)
=1/(1-2x)
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