evaluate 1+ (-2)+(-3)+4+5+(-6)+(-7)+8+...+2016+2017+(-2018)?

2017-08-30 5:05 pm

回答 (1)

2017-08-30 5:40 pm
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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