2a*2b+6a*2b

a-b+2b²/a+b 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 计算：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b) 计算·[(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 (a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²) (a/a-b-a/a+b)(a+b)(a-b)/2b (b-a)*(b-a)+(b-a)*2*a等于多少? 因式分解(a-b)^2-(a-b)-2 (a+b)^2+(a+b)-6 （3a+2b)(6a-5b)(2b-3a)(5a+6b) (a+2b)(2a+4b)(3a+6b)(4a+8b)