(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)

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(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)(x^2-1)\(x^2-4x+

(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)
(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)

(x^2-1)\(x^2-4x+a)除以(x+1)x(x^2-3x+2)\(x-1)
a错了,是4
原式=(x+1)(x-1)/(x-2)²*1/(x+1)*(x-1)(x-2)/(x-1)
=(x-1)/(x-2)²*(x-2)
=(x-1)/(x-2)

楼上正解

3