-5a+(3a-2)-(3a-7)
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-5a+(3a-2)-(3a-7)-5a+(3a-2)-(3a-7)-5a+(3a-2)-(3a-7)-5a+(3a-2)-(3a-7)=-5a+3a-2-3a+7=-5a+3a-3a-2+7=-5a
-5a+(3a-2)-(3a-7)
-5a+(3a-2)-(3a-7)
-5a+(3a-2)-(3a-7)
-5a+(3a-2)-(3a-7)
=-5a+3a-2-3a+7
=-5a+3a-3a-2+7
=-5a+5
=5-5a
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
[-a*(-2a)^3*(-a)^5]^7
合并同类项：a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a+12a+……+2008a+2009a-2010a-2011a
化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a
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)=?
化简(a+ 3)(a-3) (a-5)(a+7)-2a(a-1)
(a+3)(a-3)+(a-5)(a+7)-2a(a-1)怎么做?
-[-7a平方-5a+(2a平方-3a)+2a]-4a平方. 很急啊.