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1.991+1.992+1.993+...+2.001+2.002+2.003

分类: 作业答案 • 2022-08-10 00:16:21

问题描述：

1.991+1.992+1.993+...+2.001+2.002+2.003

答

=13*(1.991+2.003)/2
=13*3.994/2
=25.961