问题 解答题
怎样简便就怎样计算.
57.5-4.25-15.75    125×32   
5
7
×16.31-2.31÷
7
5
答案

①57.5-4.25-15.75

=57.5-(4.25+15.75)

=57.5-20

=37.5;

②125×32

=125×8×4

=1000×4

=4000;

5
7
×16.31-2.31÷
7
5

=

5
7
×16.31-2.31×
5
7

=

5
7
×(16.31-2.31)

=

5
7
×14

=10.

单项选择题
单项选择题 A1/A2型题