提问1+2+3+4+5+6+.+99= 给个答案和出个同类的题

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提问1+2+3+4+5+6+.+99= 给个答案和出个同类的题
提问1+2+3+4+5+6+.+99= 给个答案和出个同类的题

提问1+2+3+4+5+6+.+99= 给个答案和出个同类的题
=(1+99)*99/2
=4950
同类题目:
1+3+5+7+9+...+99=
方法:高斯定律
和=(首项+末项)乘 项数 除2
末项=首项+(项数-1)乘 公差
项数=(末项-首项)除以 公差+1
应用于等差数列

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