填空题:(a-b-c-d)(a+b-c+d)=[( )+( )][( )-( )]

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填空题:(a-b-c-d)(a+b-c+d)=[( )+( )][( )-( )]
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填空题:(a-b-c-d)(a+b-c+d)=[( )+( )][( )-( )]
填空题:(a-b-c-d)(a+b-c+d)=[( )+( )][( )-( )]

填空题:(a-b-c-d)(a+b-c+d)=[( )+( )][( )-( )]
=[(a-b)- (c-d )][(a-b )+(c-d)]

(a-b-c-d)(a+b-c+d)
=[( a-d)+(b+c )][(a-d )-(b+c )]
=(a-d)^2-(b+c)^2

(a-b-c-d)(a b-c d)=[( a-d) (b c )][(a-d)-(b c )]=(a-d)^2-(b c)^2
谢谢采的纳,手机打字好痛苦的