19.94-100+99-98+...+3-2+1简便计算
问题描述:
19.94-100+99-98+...+3-2+1简便计算
答
19.94-100+99-98+...+3-2+1
=19.94-(100-99)-(98-97)-.-(2-1)
=19.94-50
=-30.06