(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,
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![(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,](/uploads/image/z/129205-37-5.jpg?t=%28a%2B3a%2B+5a%2B%60%60%60%2B2007a%29-%282a%2B4a%2B6a%2B%60%60%60%2B2008a%29%3D%3F%28a%2B3a%2B+5a%2B%60%60%60%2B2007a%29-%282a%2B4a%2B6a%2B%60%60%60%2B2008a%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%E5%92%8C%E4%BB%A3%E6%95%B0%E5%BC%8F%2C)
(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,
(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,
(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,
=(-a)+(-a)+...+(-a) 注:一共有1004个(-a)
= - 1004a
化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a.
5a-a*a+[5a*a-3a]-6*[a*a-a]
(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,
9a*a*a*a-()=(3a*a+5c)(3a*a-)
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)=
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+a+5+a+6+a+7.+a+2013+a+2014=?
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
a
a