[2a-6b].[3a+9b]

A-B A+B 2B+A 3A-B 6A+2B 先化简,再求值：(2a-b)^2-(2a+b)(a-b)-3(a-3b)(a+3b),其中|a-1|+b^2=6b-9 (a^2+1)(-4a^2+1)+a^4-1 3a(a-b)(a+b)-6(b-a)^2a^2-9(a-b)^2= 3a(a-b)(a+b)-6(b-a)^2= 9(a-b)(a+b)-3(a-b)^2 因式分解:3b(b-a)+6a(a-b)^2 (3a-2b)(9+6b) a+2b/2a-3b=3 求解4b+2a/9b-6a-4a-6b/3a+6b=? 当a+2b/2a-3b=3,求代数式4b+2a/9b-6a-4a-6b/3a+6b a+2b/2a-3b=3 求解4b+2a/9b-6a-4a-6b/3a+6b=? 计算(3a-2b)(9a*a+6ab+4b*b)-(3a+2b)(9a*a-6ab+4b*b) 因式分解：9(a+b)(a+b)+6(a-b)(a+b)+(a-b)(a-b) (a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) 3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}= 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) (3a-2b)(9a+6b) [2a-6b].[3a+9b] (2a-3b)[(a+b)-b(a-3b)] [3(a+b)^3-6(a+b)^2+9(b+a)]÷[二分之三(a+b)]