已知:(10a+b)(10c+d)=(10a+c)(10b+d)=1000a+100b+10c+d,求a.b.c.d.
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已知:(10a+b)(10c+d)=(10a+c)(10b+d)=1000a+100b+10c+d,求a.b.c.d.
![已知:(10a+b)(10c+d)=(10a+c)(10b+d)=1000a+100b+10c+d,求a.b.c.d.](/uploads/image/z/14713657-25-7.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%2810a%2Bb%29%2810c%2Bd%29%3D%2810a%2Bc%29%2810b%2Bd%29%3D1000a%2B100b%2B10c%2Bd%2C%E6%B1%82a.b.c.d.)
(10a+b)(10c+d)=(10a+c)(10b+d)推出d=100a
(10a+b)(10c+d)=100ac+10ad+10bc+bd代入d=100a得
(10a+b)(10c+d)=100ac+1000a*a+10bc+100ab=1000a*a+100(ac+ab)+10bc
题目中
(10a+b)(10c+d)=1000a+100b+10c+d=1000a+100b+10c+100a=1000a+100(a+b)+10c与上式比较,得a=1,b=1,c=1,d=100,验证正确
(10a+b)(10c+d)=100ac+10ad+10bc+bd代入d=100a得
(10a+b)(10c+d)=100ac+1000a*a+10bc+100ab=1000a*a+100(ac+ab)+10bc
题目中
(10a+b)(10c+d)=1000a+100b+10c+d=1000a+100b+10c+100a=1000a+100(a+b)+10c与上式比较,得a=1,b=1,c=1,d=100,验证正确
已知:(10a+b)(10c+d)=(10a+c)(10b+d)=1000a+100b+10c+d,求a.b.c.d.
已知:(10a+b)(10c+d)=(10a+c)(10b+d)=1000a+100b+10c+d,求a.b.c.d.(
已知a:b=c:d,求证(a+c):(a-c)=(b+d):(b-d)
( )-(c-d)=(a-c)-(-b+d)
若a=1,b=10,c=100,d=1000则(a+b+c-d)+(a+b+d-c)+(a+c+d-b)-(a-b-c-
已知向量a+b+c+d=0,求证|a|+|b|+|c|+|d| >=|a+d|+|b+d|+|c+d|.
[a,b)×[c,d
a,b ,c ,d
a b c d* d_________=d c b a
若a=1,b=10,c=100,d=1000,则(a+b+c-d)+(a+b+d-c)-(b+c+d-c)= 等于多少
a=(10+b+c+d+h)/39 b=(10+a+c+d+h)/29 c=(10+a+b+d+h)/19 d=(10+
实数a,b,c,d满足d>c;a+b=c+d;a+d