1+2+3+4+5+6+7+8+9+10+11+12+13.+100
题目
1+2+3+4+5+6+7+8+9+10+11+12+13.+100
答案
1+2+3+4+5+6+7+8+9+10+11+12+13.+100
=(100+1)*100/2
=5050
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