5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
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5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
5a^2-[a^2+(5a^2-2a)-2(a^2-3a)] =5a^2-[a^2+5a^2-2a-2a^2+6a] =5a^2-[4^2+4a] =5a^2-4^2-4a =a^2-4a =a(a-4)
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)=?
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=
5a-【a+(5a-2a)-2(a-3a)-4a】
(5A+2A-3-4A)-(-A+3A-A)其中A=-2
5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b)
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
(a-5)(a-2)+6-a 因式分解,