(b-2a)^2÷(-b/a)*(-3b/4a)^3 (x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1(b-2a)^2÷(-b/a)*(-3b/4a)^3 (x-1/x+2)*(x^2-4/x^2-2x+1)÷1/x^2-1

(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] (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 (2a-3b)[(a+b)-b(a-3b)] 化简：{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)] 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) 化简（2a-b/a+b-b/a-b）÷a-2a/a-b -2a(a+b)+b(a+b) 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 a^2(a-b)+b^2(b-a) 因式分解 (a-b)^3-(a-b)^2 因式分解 A-B A+B 2B+A 3A-B 6A+2B 2(a+3b)²-8(a+b)(a-b)-(a+3b)(a-b) 化简a/b(a-b)-b/a(a-b)其中a=3 b=-2 2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a 计算：(b/a)^2÷（a/b)-b^3/a^3(a-b) ÷ 1/a-b