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化简分式 (1)x²+x/x²-1 (2)x²-9/x²-6x+9
人气:453 ℃ 时间:2020-01-28 19:44:11
解答
x²+x/x²-1 =x(x+1)/(x+1)(x-1)=x/(x-1)
x²-9/x²-6x+9 =(x+3)(x-3)/(x-3)^2=(x+3)/(x-3)
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