(a+1/a)*=a*+2+1/a* (a-1/a)*=a*-2+1/a*
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a
(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+1/a)*=a*+2+1/a* (a-1/a)*=a*-2+1/a*
(a 1)(a 2)(a 3)(a
1+a^1+a^2+a^3+.+a^n=?
{1,a,b/a}={0,a^2,a+b}
先化简,再求值:(a-1/a-a-2/a+1)÷2a^2-a/a^+2a+1,其中a满足a^2-a-1=0
先化简后,再求值:(a-2/a*a+2a-a-1/a*a+4a+4)/a-4/a+2其中a=根号2-1
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=
(a-a/a-1)÷a²+a/a-1,(a=根号2sin45°+2)