(1/a+1/b)²/(1/a²-1/b²)等于几

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(1/a+1/b)²/(1/a²-1/b²)等于几

(1/a+1/b)²/(1/a²-1/b²)等于几
(1/a+1/b)²/(1/a²-1/b²)等于几

(1/a+1/b)²/(1/a²-1/b²)等于几
(a+b)/(b-a)