(5a+6b-7c)^2-(5a-6b+7c)^2

5a-{-3b+[6c-2a-(a-c)]}-[9a-(7b+c）] {A+2B-3C=4,5A-6B+7C=8}求代数式A:B:C 2A-3C／A+2B 已知a-b/2=b-2c/3=3c-a/4.求5a+6b-7c/4a-3b+9c (5a+6b-7c)^2-(5a-6b+7c)^2 已知a,b,c满足4a-3b-2c=0,且a+b+3c=0,求(2a^2+3b^2+6c^2)/(a^2+5b^2+7c 已知a,b,c满足4a-3b-2c=0,且a+b+3c=0,求(2a^2+3b^2+6c^2)/(a^2+5b^+7c^ b/(a+c)=1/2,a/(b+c)=1/5 怎么得出a/(a+b+c)=1/6,b/(a+b+c)=1/3? a←5 b←7 c←b-a b←a+b+c Print c/2 End 若|a|=5,|b|=2,|c|=6且|a+b|=-（a+b）,|a+c|=a+c,求a-b+c的值 若|a|=5,|b|=2,|c|=6,且|a+b|=-(a+b),|a+c|=a+c,求a-b-c的值 分式加减法5a/3(b^2)c - 7b/6ac^2 + 11c/4(a^2)b 1.计算5a/(6a^2c)-7b/(12ac^2)+11c/8a^2b