计算1+5+2+10+3+15+...+100+500

分类: 作业答案 • 2022-01-19 23:40:13

问题描述：

答

1+5+2+10+3+15+...+100+500
=(1+5)+(2+10)+(3+15)+...+(100+500)
=6+2x6+3x6+……+100x6
=6x(1+2+3+……+100)
=6x[100x(100+1)]/2
=3x100x101
=30300