(a+d+c-d)(a-b+c+d)=?
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(a+d+c-d)(a-b+c+d)=?(a+d+c-d)(a-b+c+d)=?(a+d+c-d)(a-b+c+d)=?(a+b+c-d)(a-b+c+d)=[(a+c)+(b-d)][(a+c)-(
(a+d+c-d)(a-b+c+d)=?
(a+d+c-d)(a-b+c+d)=?
(a+d+c-d)(a-b+c+d)=?
(a+b+c-d)(a-b+c+d)
=[(a+c)+(b-d)][(a+c)-(b-d)]
=(a+c)²-(b-d)²
=a²+c²-2ac-b²-d²+2bd
(a+d+c-d)(a-b+c+d)
=[(a+c)+(b-d)] *[(a+c)-(b-d)]
=(a+c)²-(b-d)²
由题可知a=2,b=9.则原式=2的2次方-9的2次方=4-81=-79
( )-(c-d)=(a-c)-(-b+d)
已知d>c a+b=c+d a+d
(a+d+c-d)(a-b+c+d)=?
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
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
a b c d* d_________=d c b a
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