(1)(a+1)(a-1)=______;(2)(-a+1)(-a-1)=______;(3)(-a+1)(a+1)=______;(4)(a+1)(-a-1)=__

发布时间:2020-08-08 00:34:30

(1)(a+1)(a-1)=______;
(2)(-a+1)(-a-1)=______;
(3)(-a+1)(a+1)=______;
(4)(a+1)(-a-1)=______.

网友回答

解:(1)a+1)(a-1)=a2-1;
(2)(-a+1)(-a-1)=(-a)2-1=a2-1;
(3)(-a+1)(a+1)=(1-a)(1+a)=1-a2;
(4)(a+1)(-a-1)=-(a+1)2=-a2-2a-1.
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