问题 解答题

怎样简便就怎样算.

12.75-(6.57+2.75)

4.8÷0.24÷2

5.8-1.29+4.2-7.71

0.25×1.25×32.

答案

(1)12.75-(6.57+2.75)

=12.75-2.75-6.57,

=10-6.57,

=3.43;

(2)4.8÷0.24÷2

=4.8÷2÷0.24,

=2.4÷0.24,

=10;

(3)5.8-1.29+4.2-7.71

=(5.8+4.2)-(1.29+7.71),

=10-9,

=1;

(4)0.25×1.25×32

=0.25×4×(1.25×8),

=1×10,

=10.

单项选择题
名词解释