问题 解答题
下面各题怎样算简便就怎样算.
3.2+7.5×0.5

0.73×50×0.4
0.9×[13-(4.75+5.25)]2.78+59.8+1.22
9.63×2.5+6.37×2.5(12-1.5÷0.5)×4.2.
答案

(1)3.2+7.5×0.5,

=3.2+3.75,

=6.95;

(2)0.73×50×0.4,

=0.73×(50×0.4),

=0.73×20,

=14.6;

(3)0.9×[13-(4.75+5.25)],

=0.9×[13-10],

=0.9×3,

=2.7;

(4)2.78+59.8+1.22,

=(2.78+1.22)+59.8,

=4+59.8,

=63.8;

(5)9.63×2.5+6.37×2.5,

=(9.63+6.37)×2.5,

=16×2.5,

=40;

(6)(12-1.5÷0.5)×4.2,

=(12-3)×4.2,

=9×4.2,

=37.8.

选择题
单项选择题 案例分析题