686×99的简便计算

来源:学生作业帮助网 编辑:作业帮 时间:2018/08/14 22:04:04
686×99的简便计算686×99的简便计算686×99的简便计算686×99=686×(100-1)=686×100-686=68600-686=67914686x100-686686×100-68

686×99的简便计算
686×99的简便计算

686×99的简便计算
686×99
=686×(100-1)
=686×100-686
=68600-686
=67914

686x100-686

686×100-686=68600-686=67914

686×(100-1)
=686×100-686
=68600-686
=67914

686X(100-1)=686X100-686X1=68600-686=67914