777×5+999×7+222用简便方法计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 10:00:05
![777×5+999×7+222用简便方法计算](/uploads/image/z/188575-7-5.jpg?t=777%C3%975%2B999%C3%977%2B222%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97)
777×5+999×7+222用简便方法计算
777×5+999×7+222用简便方法计算
777×5+999×7+222用简便方法计算
7*(111*5+999)+222
=7*(111*5+111*9)+111*2
=7*111*14+111*2
=111*(7*14+2)
=111*(7*7*2+2)
=111*2*(7*7+1)
=111*2*50
=11100