1+3+5+7+9+11.+33

tt的胡同2022-10-04 11:39:546条回答

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1896656 共回答了16个问题 | 采纳率87.5%
1+3+5+7+9+11.+33
=17*17
=289
连续奇数的和等于它们个数的平方
1年前
louwd88 共回答了1个问题 | 采纳率
无语
1年前
wwwwyyyyhhhh 共回答了9个问题 | 采纳率
(1+33)*16+17=561 希望能帮到你.
1年前
evaandzh 共回答了9个问题 | 采纳率
梯形公式
(1+33)×17÷2=289
17指的是从1、3、5、7…… 33,共17个数字,个数就是(33-1)÷2+1
1年前
康晨光 共回答了40个问题 | 采纳率
(1+33)((33-1)/2+1)÷2=289
1年前
qq800010 共回答了1个问题 | 采纳率
289
1年前

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69days1年前1
linxblinxb 共回答了15个问题 | 采纳率86.7%
我给你
做个题lim[1/2×5 +1/5×8+1/8×11.+1/(3n-1)(3n+2) n→∞
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forever748 共回答了19个问题 | 采纳率89.5%
1/2×5 +1/5×8+1/8×11.+1/(3n-1)(3n+2)=1/3*(1/2-1/5+1/5-1/8+...+1/(3n-1)-1/(3n+2))
=1/3*(1/2-1/(3n+2))
所以lim(n→∞)[1/2×5 +1/5×8+1/8×11.+1/(3n-1)(3n+2) ]
=lim(n→∞)[1/3*(1/2-1/(3n+2))]
=1/3*(lim(n→∞)1/2-lim(n→∞)(1/(3n=2))
=1/3*(1/2-0)
=1/6
1+3+5+7+9+11.+99
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1+3+5+7+11+…+99共50个数字
则1+3+5+7+11+…+99=(1+99)×50/2=2500
1+2+3+4+5+6+7+8+9+10+11.+66=?
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是2211