53×57-47×43 简便算法...麻烦具体点...
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/17 08:18:25
![53×57-47×43 简便算法...麻烦具体点...](/uploads/image/z/199844-44-4.jpg?t=53%C3%9757-47%C3%9743+%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95...%E9%BA%BB%E7%83%A6%E5%85%B7%E4%BD%93%E7%82%B9...)
53×57-47×43 简便算法...麻烦具体点...
53×57-47×43 简便算法...
麻烦具体点...
53×57-47×43 简便算法...麻烦具体点...
53×57-47×43
=53×57-(57-10)×43
=53×57-57×43+10×43
=57×(53-43)+10×43
=(57-43)×10
=140
(47+10)*(43+10)-47×43
=47*43+47*10+10*43+10*10-47*43
=47*10+10*43+10*10
=(47+43)*10+100
=900+100
=1000