化简3a-[5a-(2a-1)]
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
(a 1)(a 2)(a 3)(a
化简:3a-[5a-(2a-1)]=
(2a^2+3a+2)/(a+1)-(a^2-a-5)/(a+2)-(3a^2-4a-5)/(a-2)+(2a^2-8a
求(2a平方+3a+2)/(a+1)-(a平方-4a-5)/(a+2)-(3a平方-4a-5)/(a-2)+(2a平方a
化简 a-2a+3a-4a+5a'''''''+99a-100a a=-2 的值
a+a^2+a^3+a^4+a^5+a^6...+a^n=a^n+1-a/a-1 (a-1)≠0
化简 3(-3a^2-2a)-[a^2-2(5a-4a^2+1)-3a]
化简:(3a-2a^2)-[5a-1/3(6a^2-9a)-4a^2].
当a=1时,a-2a+3a-4a+5a…+99a-100a=
化简:5a²-【a²+(5a²-2a)-2(a²-3a)】
当a=1/2+根号5时,化简9-6a+a^2/a-3加(根号下a^2-2a+1)/a^2-a