:(1+x)^2/(1-x^2)÷(2x/1-x -x),其中x=根号2
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(1+x)^2/(1-x^2)÷(2x/1-x -x)
=(1+x)^2/(1-x)(1+x)÷(2x/1-x -x)
=(1+x)/(1-x)÷(2x-x(1-x)/1-x)
=(1+x)/(1-x)÷(2x-x+x^2)/(1-x)
=(1+x)/(1-x)÷(x+x^2)/(1-x)
=(1+x)/(1-x)*(1-x)/(x+x^2)
=(1+x)/(1-x)*(1-x)/x(1+x)
=1/x
x=根号2
=1/x=1/根号2
=(1+x)^2/(1-x)(1+x)÷(2x/1-x -x)
=(1+x)/(1-x)÷(2x-x(1-x)/1-x)
=(1+x)/(1-x)÷(2x-x+x^2)/(1-x)
=(1+x)/(1-x)÷(x+x^2)/(1-x)
=(1+x)/(1-x)*(1-x)/(x+x^2)
=(1+x)/(1-x)*(1-x)/x(1+x)
=1/x
x=根号2
=1/x=1/根号2
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