(3a^-2 B^-4)^2 · (2a^3b^3)^2/(3^-1a^2 b^3)^-3 =?

2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 2a(a-b)+4a(2a+3b) (a+3b)(a-3b)-(3a-b)的平方+(4a+5b)·(a+2b) 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) 计算：(4a-b)^2-[8a*(a-b)-(3a-b)*(3a+b)] (a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a] 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b] (a-b)^4+a^2(b-a)^2-2a(b-a)^3 . 2a-{7b+[4a-7b-(2a-6a-4b)]-3a （3a+4b)(7a-8b)+(11a+2b)(8a-7a) 计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b) a+a-a+2a-3a-2b+3b-5b+3b-4b-5b 计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b) (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= 2a+(4a-5a)-3(a-2b) 2a+(4a-5b)-3(a-2b)