先化简,再求值先化简,再求值{1-x/x+1-1}÷2x/x²-1 ,其中x=1-√2

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先化简,再求值先化简,再求值{1-x/x+1-1}÷2x/x²-1 ,其中x=1-√2
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先化简,再求值先化简,再求值{1-x/x+1-1}÷2x/x²-1 ,其中x=1-√2
先化简,再求值先化简,再求值{1-x/x+1-1}÷2x/x²-1 ,其中x=1-√2

先化简,再求值先化简,再求值{1-x/x+1-1}÷2x/x²-1 ,其中x=1-√2
[(1-x)/(x+1)-1]÷2x/(x²-1)
=[(1-x-x-1)/(x+1)]÷2x/(x²-1)
=-2x/(x+1)÷2x/(x²-1)
=-2x/(x+1)*(x²-1)/2x
=-(x²-1)/(x+1)
=-(x-1)(x+1)/(x+1)
=-(x-1)
=1-x
=1-(1-√2 )
=1-1+√2
=√2