化简:2(2a^2+9b)+3(-5a^2-6b)
(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)
化简 |a+b|-|3a-2b|
化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
化简(2a-b/a+b-b/a-b)除以a-2b/a +b
化简(2a-b/a+b-b/a-b)除以a-2b/a+b
先化简,再求值:(2a-b)^2-(2a+b)(a-b)-3(a-3b)(a+3b),其中|a-1|+b^2=6b-9
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
[(a-2b)²-(a+3b)(a-2b)]/(-5b)化简.
因式分解(a-b)-3a+3b (a+b)(a-b)-2b(3a-5b)
[(a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a
计算:(-2a^2b)^2-(3a^3b^2)÷5a^2b^2+7a^9b^6÷2a^5b^4