化简:2(3a-1)-3(2-5a 3a2)我这样做对不对：2(3a-1)-3(2-5a+3a2)=6a-2-6-15a-9a2=6a-15a-8-9a2=-9a-8-9a2
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化简:2(3a-1)-3(2-5a3a2)我这样做对不对：2(3a-1)-3(2-5a+3a2)=6a-2-6-15a-9a2=6a-15a-8-9a2=-9a-8-9a2化简:2(3a-1)-3(2
化简:2(3a-1)-3(2-5a 3a2)我这样做对不对：2(3a-1)-3(2-5a+3a2)=6a-2-6-15a-9a2=6a-15a-8-9a2=-9a-8-9a2
化简:2(3a-1)-3(2-5a 3a2)
我这样做对不对：
2(3a-1)-3(2-5a+3a2)
=6a-2-6-15a-9a2
=6a-15a-8-9a2
=-9a-8-9a2
化简:2(3a-1)-3(2-5a 3a2)我这样做对不对：2(3a-1)-3(2-5a+3a2)=6a-2-6-15a-9a2=6a-15a-8-9a2=-9a-8-9a2
不对.
应该是
2(3a-1)-3(2-5a+3a2)
=6a-2-6+15a-18a
=6a+15a-18a-2-6
=3a-6
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
化简：a-2a+3a-4a+5a-6a+.+2010a+2011a.
化简 3a-[5a-(a+2)+a]-1
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
化简：a(a*a-1)+2a*a(a+1)-3a(2a-5)拜托了各位
化简(a+ 3)(a-3) (a-5)(a+7)-2a(a-1)
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)
[a/(a-1)+a/(a+2)](a+2)/(2a平方+3a+1)化简
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a-2a+3a-4a+5a-6a+...+99a-100a
(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)=
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)=?