问题 解答题
简便运算.
198-(98+37)
7
4
×12.5×
5
7
×8
7
16
×40-
5
16
÷
1
40
答案

(1)198-(98+37 )

=198-98-37,

=100-37,

=63;

(3)

7
4
×12.5×
5
7
×8

=(

7
4
×
5
7
)×(12.5×8),

=

5
4
×100,

=125;

7
16
×40-
5
16
÷
1
40

=

7
16
×40-
5
16
×
40,

=(

7
16
-
5
16
)×40,

=

1
8
×40,

=5.

单项选择题
单项选择题