evaluate 1+ (-2)+(-3)+4+5+(-6)+(-7)+8+...+2016+2017+(-2018)?
回答 (1)
Evaluate 1+ (-2)+(-3)+4+5+(-6)+(-7)+8+...+2016+2017+(-2018)?
Sol
1+ (-2)+(-3)+4+5+(-6)+(-7)+8+...+2016
=(1-2-3+4)+(5-6-7+8)+(9-10-11+12)+…+(2013-2014-2015+2016)
=0+0+0+...+0
=0
1+ (-2)+(-3)+4+5+(-6)+(-7)+8+...+2016+2017+(-2018)
=2017-2018
=-1
收錄日期: 2021-04-24 00:44:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170830090553AAZKWi4
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