问题 解答题

用简便方法计算

4×9.6×2.5  

5.4×102  

9.7×0.47+0.53×9.7.

答案

(1)4×9.6×2.5,

=(4×2.5)×9.6,

=10×9.6,

=96;

(2)5.4×102,

=5.4×(100+2),

=5.4×100+5.4×2,

=540+10.8,

=550.8;

(3)9.7×0.47+0.53×9.7,

=9.7×(0.47+0.53),

=9.7×1,

=9.7.

单项选择题
单项选择题