问题 解答题

简便算法

17.08×2.53-7.08×2.53

100×0.97×99+3×99

19.25×9.5+19.25×0.4+0.1×19.25.

答案

(1)17.08×2.53-7.08×2.53,

=(17.08-7.08)×2.53,

=10×2.53,

=25.3;

(2)100×0.97×99+3×99,

=97×99+3×99,

=(97+3)×99,

=100×99,

=9900;

(3)19.25×9.5+19.25×0.4+0.1×19.25,

=19.25×(9.5+0.4+0.1),

=19.5×10,

=195.

单项选择题
单项选择题