已知x^2007=2,則(x^2006+x^2005+x^2004+...+x+1)(x-1)的值
已知x^2007=2,則(x^2006+x^2005+x^2004+...+x+1)(x-1)的值
數(shù)學人氣:353 ℃時間:2019-12-08 11:56:56
優(yōu)質(zhì)解答
由題意可知x≠1,由等比數(shù)列前n項和公式得:(x^2006+x^2005+x^2004+...+x+1)(x-1)=[(1-x^2007)/(1-x)](x-1)=x^2007-1=1
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