256×5-55×5-5的简便方法是多少？

Question

如题所述

Answer 1

256×5-55×5-5

=256×5-55×5-5×1............改写

=5×（256-55-1）............乘法的分配律

=5×200

=1000

Answer 2

简便计算
256×5-55×5-5
=（256-55-1）x5
=200x5
=1000