(a-b-c+d)(a-b+c-d)=[(a-b)- ( )][( )+(c-d)]填空题
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(a-b-c+d)(a-b+c-d)=[(a-b)-()][()+(c-d)]填空题(a-b-c+d)(a-b+c-d)=[(a-b)-()][()+(c-d)]填空题(a-b-c+d)(a-b+c-
(a-b-c+d)(a-b+c-d)=[(a-b)- ( )][( )+(c-d)]填空题
(a-b-c+d)(a-b+c-d)=[(a-b)- ( )][( )+(c-d)]填空题
(a-b-c+d)(a-b+c-d)=[(a-b)- ( )][( )+(c-d)]填空题
=[(a-b)- (c-d )][(a-b )+(c-d)]
( )-(c-d)=(a-c)-(-b+d)
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) (b) (c) (d)
A,B,C,D
A B C D
已知d>c a+b=c+d a+d
(a+d+c-d)(a-b+c+d)=?
a b c d* d_________=d c b a
实数a,b,c,d满足d>c；a+b=c+d；a+d
实数a,b,c,d,满足,d>c,a+b=c+d,a+d
已知a>b>c>d>0,a/b=c/d,求证a+d>c+d
已知a:b=c:d,求证(a+c):(a-c)=(b+d):(b-d)
a>b>c>d>0.a/b=c/d怎么证明a+d>c+b