1+2+3+4+5+6+7+8+9+10+11+12+13.+1000=?

ZNNZNN04182022-10-04 11:39:541条回答

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不在线吗 共回答了17个问题 | 采纳率100%
(1+1000)*1000/2=500500
1年前

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1+2+3+4+5+6+7+8+9+10+11+12+13.+97+98+99+100
分析,首尾相加都等于101,总共有50个
原式=(1+100)*50
=5050
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1,(2-x)/(x+3)≥0
x≠-3.
两边同时乘以(x+3)^2,
(2-x)(x+3)≥0
(x-2)(x+3)≤0
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1+2+3+4+5+6+7+8+9+10+11+12+13.+100?
1+2+3+4+5+6+7+8+9+10+11+12+13.+100?
得多少?
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请用高斯求和法,头尾相加,即(100+1)+(99+2)+...+(50+51)=101*50=5050
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1÷(1/10+1/11+1/121/13.+1/19)
错了错了,1/12和1/13之间少了一个加号
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解:1/10+1/11+1/12+1/13+…1/19<1/10+1/10+1/10+1/10+…1/10=1
1/10+1/11+1/12+1/13+…1/19>1/20+1/20+1/20+1/20+…1/20=0.5
设(1/10+1/11+1/12+1/13+…1/19)为X
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所以1/X的整数部分是1
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选B.
at后面不能接副词,所以不能选A.如果用where,回答的话应该是where is called Grand Hotel,不加at.
at后面缺少一个成分,is called Grand Hotel缺少一个主语,所以应该用what.
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