1+3+5+7+9+11.+99

shawxb2022-10-04 11:39:545条回答

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yuanbo00 共回答了23个问题 | 采纳率100%
1+3+5+7+11+…+99共50个数字
则1+3+5+7+11+…+99=(1+99)×50/2=2500
1年前
风风飘飘 共回答了1个问题 | 采纳率
4950
1年前
海箫圻 共回答了25个问题 | 采纳率88%
1+99=100
3+97=100
.......
25*100=2500
1年前
zzj_12 共回答了11个问题 | 采纳率
唉 我会做的啊啊啊
可被人抢掉了啊
1年前
tanxiutaotxt 共回答了12个问题 | 采纳率
所以1-3+5-7+9-11+。-1999+2001=1001 1+2+2.+2=1+2x500=1001
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→∞
白发三亿丈1年前2
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.+33
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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+2+3+4+5+6+7+8+9+10+11.+66=?
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kuaile366223116 共回答了18个问题 | 采纳率83.3%
是2211