(1/3)×A=(2/3)×A+0.5
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a
(a 1)(a 2)(a 3)(a
1+a^1+a^2+a^3+.+a^n=?
(高一集合)已知A={2,4,a*a*a-2a*a-a+7},B={1,a+3,a*a-2a+2,a*a*a+a*a+3
a+a^2+a^3+a^4+a^5+a^6...+a^n=a^n+1-a/a-1 (a-1)≠0
(a2-a)a2-2a-3÷a(a-3)=a(a-1)(a+1)(a
当a=1时,a-2a+3a-4a+5a…+99a-100a=
已知a-1/a=3,求a-1/a和a^2-1/a^2
(a+3a+5a+...+2009a)-(2a+4a+6a+...+2008a)=
(a+3a+ 5a+```+2007a)-(2a+4a+6a+```+2008a)=?
(a+3a+5a+...+2013a)-(2a+4a+6a+...+2012a)=
a(a-1)(a-2)(a-3)(a-4)因式分解