87x86/3的简便算法
87x86/3的简便算法
日期:2021-07-03 10:46:00 人气:1
87×86/3
=87/3×86
=29×86
=(30-1)*86
=2580-86
=2580-80-6
=2500-6
=2494
87×3/86
=(86+1)×3/86
=86×3/86+1×3/86
=3+3/86
=3又3/86
扩展资料:
乘法:
1)乘法交换律:a*b=
87x86/3的简便算法
87×86/3
=87/3×86
=29×86
=(30-1)*86
=2580-86
=2580-80-6
=2500-6
=2494
87×3/86
=(86+1)×3/86
=86×3/86+1×3/86
=3+3/86
=3又3/86
扩展资料:
乘法:
1)乘法交换律:a*b=