A:B=2:5,B:C=3:7,A:B:C=
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化简:7(a-b-c)-5(a+b-c)+3(a-b-c)+(a+b-2)
A:B=2:5,B:C=3:7,A:B:C=( )
A:B=2:5,B:C=3:7,A:B:C=
初二分式的加减法2a-b-c/(a-b)(a-c)+ 2b-c-a/(b-c)(b-a)+ 2c-b-a/(c-b)(c-a)3a-6b/a+b- 5a-6b/a-b- 4a-5b/a+b+ 7a-8b/b-a注:有空格的地方是下一个分式
2a(a+b-c)-3b(a+b-c)+5c(c-a-b)
A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+BA-B×3=CC+2×7+2=148148-(C-32)=DA,B,C,D各是多少?
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
(a-b+c/a+b-c)-(a-2b+3c/b-c+a)+(b-2c/c-a-b)
已知:(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)=5/132,求a/(a+b)+b/(b+c)+c/(c+a)的值!(请尽快,我有急用,a/(a+b)+b/(b+c)+c/(c+a)=1/2[(a-b)/(a+b)+(b-c)/(b+c)+(c-a)/(c+a)]+3/2 (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/(c+a) 没有错吧...
有三个数A.B.C,A:B=4:3,B:C=2:5,A+B+C=15分之19,B=( )
5a+{3b+[6c-2a-2(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)}-[9a-(7b+c)]
5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
计算:5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c)]
(a-b)(b-c)(c-a)/(b-a)(a-c)2(c-b)3
3a=4b 5b=6c求a:b:c
已知B:A=3:2,且B为A,C比例中项,那么B:C=?