问题 解答题
用简便方法计算
48+89+5245×1414×12×5
答案

(1)48+89+52,

=48+52+89,

=100+89,

=189;

(2)45×14,

=45×2×7,

=90×7,

=630;

(3)14×12×5,

=14×(12×5),

=14×60,

=840.

单项选择题
单项选择题