1/x+2-x^2+2x+1/x+2÷x^2-1/x-1 x=根号2-2
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1/(x+2)-(x^2+2x+1)/(x+2)÷(x^2-1)/(x-1)
=1/(x+2)-(x+1)²/(x+2) × (x-1)/(x+1)(x-1)
=1/(x+2)-(x+1)/(x+2)
=(1-x-1)/(x+2)
=-x/(x+2)
=-(根号2-2)/根号2
=根号2-1
=1/(x+2)-(x+1)²/(x+2) × (x-1)/(x+1)(x-1)
=1/(x+2)-(x+1)/(x+2)
=(1-x-1)/(x+2)
=-x/(x+2)
=-(根号2-2)/根号2
=根号2-1
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