(a+b)=_____,(a-b)=_____.(填二次三项式)

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(a+b)=_____,(a-b)=_____.(填二次三项式)

(a+b)=_____,(a-b)=_____.(填二次三项式)
(a+b)=_____,(a-b)=_____.(填二次三项式)

(a+b)=_____,(a-b)=_____.(填二次三项式)
(a+b)=a+2ab+b (a-b)=a-2ab+b

(a+b)=a+2ab+b (a-b)=a-2ab+b