a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6fvdsf

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a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6fvdsfa^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6fvdsfa^2b-ab-a+

a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6fvdsf
a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6
fvdsf

a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6fvdsf
a^2b-ab-a+1/ab^2+3ab-b-3除a^2+a-2/b^2+b-6 =(ab-1)(a-1)/(ab-1)(b+3)除a^2+a-2/b^2+b-6 =(a-1)/(b+3)*(b^2+b-6)/(a^2+a-2) =(a-1)/(b+3)*(b+3)(b-2)/(a+2)(a-1) =(b-2)/(a+2)