成都东站wifi密码:0.1949*019951995-0.1995*0.19491949

来源:百度文库 编辑:神马品牌网 时间:2024/04/30 11:21:44
简算
简算要过程

0.19951995 = 1.995*0.10001
0.19491949 = 1.919*0.10001
0.1949 = 1.919*10
0.1995 = 1.995*10

0.1949*0.19951995 - 0.1995*0.19491949
= 1.949*10*1.995*0.10001 - 1.995*10*1.949*0.10001
= (1.949*1.995 - 1.995*1.949)*10*0.10001
= 0