6a-8b+7a-8a化简

6a-8b+7a-8a化简 (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) 化简8(a-b)2+4(a-b)+5(b-a)-6(b-a)2 3(a-b)的平方-7(a-b)+8(a-b)的平方+6(a-b) a-b=2 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 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=（） 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=2026 （3a+4b)(7a-8b)+(11a+2b)(8a-7a) 化简(8a-7b)+(4a-5b) a+b分之3a-6b－a-b分之5a-6b－a＋b分之4a-5b－b-a分之7a-8b 化简 7.6a+6.8b-2.8a-6b 12a-4a+7b-b (3a-4b)(7a-8b)+(11a-12b)(8b-7a) (3a-4b)(5a-6b)+(7a-8b)(5a-6b)分解因式得 计算：①(6a+8b)+(a+b) ②（6a+8b）-(a+b) 化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a (7a-8b)(a-2b)+(a-8b)(a-2b)因式分解 7(a-b)²+8(a+b)²-9(a-b)²-4(a+b)²