(a-b+c-d)(a+b-c+d)=? 我急用 ! ! ! ! ! !
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(a-b+c-d)(a+b-c+d)=? 我急用 ! ! ! ! ! !
(a-b+c-d)(a+b-c+d)=? 我急用 ! ! ! ! ! !
(a-b+c-d)(a+b-c+d)=? 我急用 ! ! ! ! ! !
(a-b+c-d)(a+b-c+d)
=a²-﹙b-c+d﹚²
=a²-b²-c²-d²+2bc-2bd+2cd
原式=(a+(-b+c-d))(a-(-b+c-d))
(a-b+c-d)(a+b-c+d)
=[a-(b-c+d)][a+(b-c+d)]
=a²-(b-c+d)²
=a²-(b-c)²-2(b-c)d-d²
=a²-b²+2bc-c²-2bd+2cd-d²
出题有误,不过我按自己的理解解解看
a/b=b/c=c/d=d/a 所以根据等比定律
(如:若a/b=c/d,则(a b)/(c d)=a/b)
a/b=(a-b c-d)/(b-c d-a)
即a/b=b/c=c/d=d/a=(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