计算(分式):(x^2-1)(1/1+x-1/x-1-1)

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计算(分式):(x^2-1)(1/1+x-1/x-1-1)
计算(分式):(x^2-1)(1/1+x-1/x-1-1)

计算(分式):(x^2-1)(1/1+x-1/x-1-1)
(x^2-1)(1/1+x-1/x-1-1)
=(x-1)(x+1)(1/1+x-1/x-1-1)
=(x-1)-(x+1)-(x-1)(x+1)
=-2-(x平方-1)
=-x平方-1

(x+x/x^2-1)/(2+1/x-1-1/x+1)=(x+x/(x^2-1))/(2+(x+1+x-1)/(x^2-1))=((x^3-x+x)/(x^2-1))/(2+(2x)/(x^2-1))=((x^3)/(x^2-1))/(2x^2-2+2x)/(x^2-1))=x^3/(2x^3+2x-2)

(x^2-1)(1/x 1-1/x-1)=(x^2-1)(x-1-x-1)/(x 1)(x-1)=-2