(a+1)²-(a-1)²化简

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(a+1)²-(a-1)²化简(a+1)²-(a-1)²化简(a+1)²-(a-1)²化简 

(a+1)²-(a-1)²化简
(a+1)²-(a-1)²化简

(a+1)²-(a-1)²化简