1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解
(a 1)(a 2)(a 3)(a
a(a-1)(a-2)(a-3)(a-4)因式分解
当a=1时,a-2a+3a-4a+5a…+99a-100a=
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a-a a=[ ] [4]a-a=a+a
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
a/a-1÷(a-a/2a-1)
(a+1)(a+2)(a-3)计算
1A,2A,3A...
利用因式分解化解多项式:1-a^1-a(1-a)-a(1-a)^2-a(1-a)^3-……-a(1-a)^2011
已知a是实数,且a^3+a^2+a+1=0,则a^2007+a^2008+a^2009+a^2010+a^2011的值是
若a^2+a+1=0,求a+a^2+a^3+a^4+a^5+a^6+…+a^2013的值