a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?
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a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?a-2a+3a-4a+5a-6a+.+99a-1
a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?
a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?
a-2a+3a-4a+5a-6a+.+99a-100a这样的题应该怎样做呢?
a-2a+3a-4a+5a-6a+.+99a-100a
=-a-a-a.-a
共有50个-a
原式=-a*50
=-50a
a-2a+3a-4a+5a-6a+......+99a-100a
=-1a*100/2
=-50a
a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a=
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=?
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.+2008a+2009a-2010a-2011a如何合并同类项?
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
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)
(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,
化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a