先化简,再求值.[(2/x+1)+(4/x方-1)]÷x/x-1x=2、
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先化简,再求值.
[(2/x+1)+(4/x方-1)]÷x/x-1
x=2、
[(2/x+1)+(4/x方-1)]÷x/x-1
x=2、
![先化简,再求值.[(2/x+1)+(4/x方-1)]÷x/x-1x=2、](/uploads/image/z/15077310-6-0.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC.%5B%282%2Fx%2B1%29%2B%284%2Fx%E6%96%B9-1%29%5D%C3%B7x%2Fx-1x%3D2%E3%80%81)
[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)
=[2/(x-1)]÷x/(x-1)
=[2/(x-1)]×(x-1)/x
=2/x
当x=2时
上式=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)
=[2/(x-1)]÷x/(x-1)
=[2/(x-1)]×(x-1)/x
=2/x
当x=2时
上式=1
先化简,再求值.[(2/x+1)+(4/x方-1)]÷x/x-1x=2、
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