53x57一47x43的简便方法？

Question

如题所述

Answer 1

53x57一47x43的简便方法？
解析：
53×57-47×43
=53×（47+10）-47×43
=53×47+53×10-47×43
=（53-43）×47+530
=10×47+530
=470+530
=1000

Answer 2

=（10+43）×57-47×43
=570+43×57-47×43
=570+43×（57-47）
=570+430
=1000