b^2/2a^2÷(-4b^3/a^(-7))×(-b^3/a)^3

(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b] (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a] 4(a-b)3•(a+b)2÷【2(a+b)(a-b)】2 (a-b)^6*[-4(b-a)^3]*(b-a)^2÷(a-b)=求过程 2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 (a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) (a-b/a+b)^3÷(a-b)^2/a+b乘(-a+b/a-b)^2 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)] 化简：{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)] 2a(a-b)+4a(2a+3b) 计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b) (2a-3b)[(a+b)-b(a-3b)] 计算：[（2a+b）（2a-b）-4a(a-b)+3b²]÷2b 化简（2a-b/a+b-b/a-b）÷a-2a/a-b a+a-a+2a-3a-2b+3b-5b+3b-4b-5b 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a (3a+b)4b-[(2a+b+a-b)b]/2