6a=b/11 3/5a=7/8b 12/a=b/6 哪一组a与b成反比例?

已知A=5a-3b,B=-6a+4b,则A-B等于 A.-a+b,B=11a+b C.11a-7b D -a-7b 7a-8b=5,求(3a-4b)(7a-8b)-(11a-12b)(8b-7a) 6a=b/11 3/5a=7/8b 12/a=b/6 哪一组a与b成反比例? 3(a-b)的平方-7(a-b)+8(a-b)的平方+6(a-b) a-b=2 (3a-6b)/(a+b) - (5a-6b)/(a-b) - (4a-5b)/(a+b) - (7a-8b)/(a-b) 快 (3a-6b/a+b）-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) 若7a-8b=5.求(3a-4b)(7a-8b)-(11a-12b)(8b-7a)的值 (3a-4b)(7a-8b)+(11a-12b)(8b-7a) 5(a+b)-3(a-b)=2 2(a+b)+5(a-b)=7 已知A=5a-3b,B=-6a+4b,A-B=? 1.计算5a/(6a^2c)-7b/(12ac^2)+11c/8a^2b2.计算[y/(x^2-xy)+x(y^2-xy)]/(xy)3.计算{(b-c)/[(a-b)(a-c)]}+{(a-c)/[(b-a)(b-c)]}+{(a-b)/[(c-a)(c-b)]}4.已知3x/(x^2-1)=A/(x+1)+B/(x-1),求A、B的值. A+A+B=7.8,A+B+B=6,求A-B=?3A-5B=? 已知A+A+B=7.8 A+B+B=6 求 A+B=?3A-5B=? a+a+b=7.8,a+b+b=6,求a+b=?3a-5b=? 对任意自然数a,b,规定a#b=2*a+b,若a#2a#3a#4a#5a#6a#7a#8a#9a=3039,则A=（） 若a-b=5,ab=-6,求（a+b)(a+b)-3(a+b)(a-b) 若a:b=5:12,且3a-b=6,则a+b= -（8a-7b)+2(3a-5b),其中a=-3,b=2