-(-3a^2+2a-1)-a^2 化简

(a 1)(a 2)(a 3)(a 化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a. a(a-1)(a-2)(a-3)(a-4)因式分解 【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a 化简：(1-a)^2/a-1 (a 合并同类项3a*3a+a*a-(2a*2a)+(3a-a*a) a+a^2+a^3+a^4 (a+1)(a+2)(a-3)计算 1A,2A,3A... 化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b) 2a/(a平方-9)+1/(3-a)-3/(a平方+6a+9)化简 (a+2)(a-2)-a(a+1)化简