1+3+5+7+9+……+(2n-1)+(2n+1)+(2n+3)等于幾?
1+3+5+7+9+……+(2n-1)+(2n+1)+(2n+3)等于幾?
數(shù)學人氣:666 ℃時間:2020-04-29 08:37:20
優(yōu)質(zhì)解答
總共n+1項,最后一項可化為2(n+1)+1 根據(jù)等差求和公式:(n+1)*1+(n+1)*n*2/2=n*(n+2)
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