(3a^2+2a+1)-(2a^2+3a-5)怎么做啊
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(a 1)(a 2)(a 3)(a
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玩悠悠球时,1A,2A,3A,4A,5A怎么玩.
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请问2a-(5a-3b)+3(2a-b)化简怎么做?
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(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+ 5a+```+2007a)-(2a+4a+6a+```+2008a)=?
(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=