[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a^2-ab-4b^2)]4x-2/x^2-x-2+(1-1/x+1)/x/x-1

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[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a^2-ab-4b^2)]4x-2/x^2-x-2+(1-1/x+1)/x/x-1[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a

[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a^2-ab-4b^2)]4x-2/x^2-x-2+(1-1/x+1)/x/x-1
[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a^2-ab-4b^2)]
4x-2/x^2-x-2+(1-1/x+1)/x/x-1

[(2/a-2b)+(1/a-b)]*[(a-2b)/(3a^2-ab-4b^2)]4x-2/x^2-x-2+(1-1/x+1)/x/x-1
通分,再乘,得1/(a^2-b^2)