3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
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3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
3a^2-2a-5/3a^2-2a-1*a^2-1/a+1÷(a+1)
(3a^2-2a-5)/(3a^2-2a-1)*(a^2-1)/(a+1)÷(a+1)
=(a+1)(3a-5)/(a-1)(3a+1) * (a+1)(a-1)/(a+1) * 1/(a+1)
=(a+1)(3a-5)(a+1)(a-1)/(a-1)(3a+1)(a+1)(a+1)
=(3a-5)/(3a+1)
你看一下分子分母是不是这样,有不懂再追问
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a-2a+3a-4a+5a-6a+...+99a-100a
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+5a+.+2009a)-(2a+4a+6a+.2008a)
计算(a+3a+5a+...+2009a)-(2a+4a+6a+...+2010a)
(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=
化简:a-2a+3a-4a+5a-6a+.+2010a+2011a.
计算(a+3a+5a+.+2003a)-(2a+4a+6a+...+2004a)
(a+3a+5a+.+2003a)-(2a+4a+6a+.+2004a)
(a+3a+5a...+2009a)-(2a+4a+6a+...+2010a)=?
5a^-〔a^-2a-2(a^-3a)]
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