计算(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
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计算(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
计算(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
计算(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
(3ab^2+1)/(a-b)^2 - (1+3a^2b)/(b-a)^2
=【(3ab^2+1)- (1+3a^2b)】/(b-a)^2
=(3ab(b-a))/(b-a)²
=3ab/(b-a)
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