化简:2a²-[5a-1/2(a-3)+2a²]
化简:2a²-[5a-1/2(a-3)+2a²]
化简:5a²-【a²+(5a²-2a)-2(a²-3a)】
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
2/9-3a,a-1/a²-3-2a,a/a²-5a+6。
化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b)
(a 1)(a 2)(a 3)(a
3a²*a²+2a*a²*a²-4a²*a²
1.化简:(5a²+2a-1)-4(3-8a+2a²)
-(-3a²+2a-1)-a³化简
5a²-(a²+(5a²-2a)-2(a²-3a))化简
(1+a)(1-a)+(a-2)²
化简:(2a+1/a²-1)*a²-2a+1/a²-a-(1/a+1)