计算(x-2)/(x^2-4)+(x-4)/(x^2-5x+4)-(2x+1)/(x^2+x-2)

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计算(x-2)/(x^2-4)+(x-4)/(x^2-5x+4)-(2x+1)/(x^2+x-2)
计算(x-2)/(x^2-4)+(x-4)/(x^2-5x+4)-(2x+1)/(x^2+x-2)

计算(x-2)/(x^2-4)+(x-4)/(x^2-5x+4)-(2x+1)/(x^2+x-2)
原式=(x-2)/(x-2)(x+2)+(x-4)/(x-4)(x-1)-(2x+1)/(x+2)(x-1)
    =1/(x+2)+1/(x-1)-(2x+1)/(x+2)(x-1)
=[(x-1)+(x+2)-(2x+1)]/(x+2)(x-1)
  =0

好复杂。。。不想想。。