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1+2````````````````````````````+100000000=?^^`我这是靠你们呐

题目详情
1+2````````````````````````````+100000000=?
^_^`
我这是靠你们呐
▼优质解答
答案和解析
1+2````````````````````````````+100000000
=(1+100000000)*100000000/2
=5000000050000000
这种类似的题目有公式可以用
和=(首项+末项)×项数/2
这里的首项就是1,末项和项数都是100000000