数学通分两题(1) a/(a-b),b/(b-a) (2) 1/(a^2-2a+1),1/(a^2-1),1/(a^2+2a+1)

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数学通分两题(1) a/(a-b),b/(b-a) (2) 1/(a^2-2a+1),1/(a^2-1),1/(a^2+2a+1)
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数学通分两题(1) a/(a-b),b/(b-a) (2) 1/(a^2-2a+1),1/(a^2-1),1/(a^2+2a+1)
数学通分两题
(1) a/(a-b),b/(b-a)
(2) 1/(a^2-2a+1),1/(a^2-1),1/(a^2+2a+1)

数学通分两题(1) a/(a-b),b/(b-a) (2) 1/(a^2-2a+1),1/(a^2-1),1/(a^2+2a+1)
a/(a-b),- b/(a-b) (负号要单写!不能在分子分母里!)
(a^2+2a+1)/(a+b)^2(a-b)^2 ,(a^2-1)/(a+b)^2(a-b)^2 ,(a^2-2a+1)/(a+b)^2(a-b)^2