问题 解答题
下面各题怎样算简便就怎样算.
3.28×4.6+6.72×4.6
0.25×1.25×0.4
9.73×2.8-4.73×2.8.12.5×4+3.12÷1.2
25.2-(7.8-2.6)×1.314.08÷[0.8×(7.93-2.43)].
答案

(1)3.28×4.6+6.72×4.6,

=4.6×(3.28+6.72),

=4.6×10,

=46;

(2)0.25×1.25×0.4,

=(0.25×0.4)×1.25,

=0.1×1.25,

=0.125;

(3)9.73×2.8-4.73×2.8,

=2.8×(9.73-4.73),

=2.8×5,

=14;

(4)12.5×4+3.12÷1.2,

=50+2.6,

=52.6;

(5)25.2-(7.8-2.6)×1.3,

=25.2-5.2×1.3,

=25.2-6.76,

=18.44;

(6)14.08÷[0.8×(7.93-2.43)],

=14.08÷[0.8×5.5],

=14.08÷4.4,

=3.2.

单项选择题
单项选择题