简便计算67+33*19-19
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/28 07:34:23
简便计算67+33*19-19
简便计算67+33*19-19
简便计算67+33*19-19
67+33×19-19
=34+33+33×19-19
=34+33×(1+19)-19
=34-19+33×20
=15+660
=675
67+33×19—19 =67+627-19=~~~~`自己算
原式=67+32×19
=67+32×20-32
=640+35
=675