(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
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(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
=(3a+5)-[9a-(6a+2-12a+10+2a+2)]
=(3a+5)-[9a-(-4a+12)]
=3a+5-(9a+4a-12)
=3a+5-(13a-12)
=3a+5-13a+12
=-10a+17
n
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
=3a+5-{9a-[6a+2-12a+10+2a+2]}
=3a+5-{9a-6a-2+12a-10-2a-2}
=3a+5-9a+6a+2-12a+10+2a+2
=(3-9+6-12+2)a+(5+2+10)
=17-10a
合并同类项：a-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a+12a+……+2008a+2009a-2010a-2011a
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
(3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]}
（3a+5)-{9a-[6a+2-(12a-10)+2(a+1)]
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-2a-3a+4a+5a-6a-7a+8a+9a-10a-11a.+2008a+2009a-2010a-2011a如何合并同类项?
a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
求和:1,a+a^2,a^3+a^4+a^5,a^6+a^7+a^8+a^9,···（a不等于0）
2/9-3a，a-1/a²-3-2a，a/a²-5a+6。