化简:2a(a^2-3a-1)

[a/(a-1)+a/(a+2)](a+2)/(2a平方+3a+1)化简 (a 1)(a 2)(a 3)(a (a+2)(a+1)-a(a-3) 化简(a+1)(a-2)/(a+2)(a-2)+3 化简 3a-[5a-(a+2)+a]-1 化简：a(a*a-1)+2a*a(a+1)-3a(2a-5)拜托了各位 化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a. 化简：a-2a+3a-4a+5a-6a+.+2010a+2011a. 化简:(a^3-a^2-a+1)/(a^3-3a^2+3a-1) (a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简. 化简1/(a+1)(a+2)+1/(a+2)(a+3)+...+1/(a+2010)(a+2011) 化简(a+ 3)(a-3) (a-5)(a+7)-2a(a-1) 化简2a(a·a-3a-1)a乘a 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 a=[ ] (通分） a/a^a^a+3a+2 ,a/a^a+2a+1 ,-1/3a+6 （a-a/a+1)/(a*a-2a)*(a+1)/(a*a+3a+2)要详细的计算说明！ a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?