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:2024/05/13 17:40:54
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 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