-3a+5a-4a+6a;-3a+5a-4a+6a
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-3a+5a-4a+6a;-3a+5a-4a+6a-3a+5a-4a+6a;-3a+5a-4a+6a-3a+5a-4a+6a;-3a+5a-4a+6a-3a+5a-4a+6a=-7a+11a=4a-3
-3a+5a-4a+6a;-3a+5a-4a+6a
-3a+5a-4a+6a;-3a+5a-4a+6a
-3a+5a-4a+6a;-3a+5a-4a+6a
-3a+5a-4a+6a
=-7a+11a
=4a
-3a+5a-4a+6a=4a
-3a+5a-4a+6a;-3a+5a-4a+6a
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)=?
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
5a-a*a+[5a*a-3a]-6*[a*a-a]
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a a=[ ]
计算:(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+ 5a+```+2007a)-(2a+4a+6a+```+2008a)=?(a+3a+ 5a+```+2007a)-(2a+4a+6a+```+2008a)等于多少?写出过程和代数式,