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先化简,再求值.
[(2/x+1)+(4/x方-1)]÷x/x-1
x=2、
人气:128 ℃ 时间:2020-02-01 07:30:27
解答
[2/(x+1)+4/(x²-1)]÷x/(x-1)=[(2/(x+1)+4/(x-1)(x+1)]÷x/(x-1)=[2(x-1)/(x+1)(x-1)+4/(x-1)(x+1)]÷x/(x-1)=[2(x-1)+4/(x-1)(x+1)]÷x/(x-1)=[2(x+1)/(x-1)(x+1)]÷x/(x-1...
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