3+4+5+6+7+8+9+10+12+13+14+……………………………………………………+9997+9998+9999+10000=?
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S=1/2nx(n-1)
咨询记录 · 回答于2023-05-03
3+4+5+6+7+8+9+10+12+13+14+……………………………………………………+9997+9998+9999+10000=?
S=1/2nx(n-1)
S=1/2nx(n-1)=1/2x10000x10001=50005000
50005000-3=50004997
等于50004997
1~10000求和S=1/2nx(n+1)=1/2x10000x10001=50005000再减去1+2等于50004997