19.94-100+99-98+...+3-2+1
=19.94-(100-99)-(98-97)-.-(2-1)
=19.94-50
=-30.06
19.94-100+99-98+...+3-2+1简便计算
19.94-100+99-98+...+3-2+1简便计算
数学人气：706 ℃时间：2019-11-06 16:14:31
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