问题 解答题

用简便方法计算:

25×14×4

83×5+5×17

15.64-2.53-7.47.

答案

(1)25×14×4,

=25×4×14,

=100×14,

=1400;

(2)83×5+5×17,

=(83+17)×5,

=100×5,

=500;

(3)15.64-2.53-7.47,

=15.64-(2.53+7.47),

=15.64-10,

=5.64.

单项选择题
单项选择题