问题 解答题
下面各题怎样算简便就怎样算.
0.94×2.5-0.453.4×12.5×0.083.14×102
17.68÷5.2+2.7×1.50.8×[13-(3.12+5.28)].
答案

(1)0.94×2.5-0.45,

=2.35-0.45,

=1.9;

(2)3.4×12.5×0.08,

=3.4×(12.5×0.08),

=3.4×1,

=3.4;

(3)3.14×102,

=3.14×(100+2),

=3.14×100+3.14×2,

=314+6.28

=320.28;

(4)17.68÷5.2+2.7×1.5,

=3.4+4.05,

=7.45;

(5)0.8×[13-(3.12+5.28)],

=0.8×[13-8.4].

=0.8×4.6,

=3.68.

填空题
单项选择题