(-a/b)^2÷(2a^2/5b)^2×a/5b

[（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab 化简：{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)] 计算(a-b)^m(a-b)[2(b-a)]^3[(b-a)^5]^2÷(a-b)^m= 因式分解（a-b)-3a+3b (a+b)(a-b)-2b(3a-5b) (a-2b)(2a+3b)-2(2b-a)(5a-b) 解(5a+b)²-2(5a+b)(5a-b)+(5a-b)² 5(a+b)-3(a-b)=2 2(a+b)+5(a-b)=7 （3a+2b)(6a-5b)(2b-3a)(5a+6b) 8a+2b+(5a - b) (5a-3b) -3 (a平方 - 2b) 计算:(b-a)^5(a-b)^m+(a-b)^(m+3)(b-a)^2 计算:(a-b)^m+3(b-a)^2(a-b)^m(b-a)^5