2a-{6a+[5b-3a-(-5b-3a)}-5a}

（3a+2b)(6a-5b)(2b-3a)(5a+6b) 若a,b满足|a+5b-2|+(a+b-6)²=0,求代数式（a-3b)(a+2b)-(a+5b)(a+3b) (3a-6b)/(a+b) - (5a-6b)/(a-b) - (4a-5b)/(a+b) - (7a-8b)/(a-b (3a-6b/a+b）-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a) [（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a 因式分解:(a+1)(a+3)(a+5)(a+7)+15 a(a-b+2)-6b(b+1) 因式分解（a-b)-3a+3b (a+b)(a-b)-2b(3a-5b) a+(5a-3b)-(a-2b) 8a+2b+(5a - b) (5a-3b) -3 (a平方 - 2b) 5(a+b)-3(a-b)=2 2(a+b)+5(a-b)=7 (a-2b)(2a+3b)-2(2b-a)(5a-b) 计算:(b-a)^5(a-b)^m+(a-b)^(m+3)(b-a)^2