问题 解答题
脱式计算
①(8-
4
9
÷
1
3
)×
9
5

②52÷(1-
1
2
×
7
10
)×
7
8
答案

①(8-

4
9
÷
1
3
)×
9
5

=(8-

4
3
)×
9
5

=

20
3
×
9
5

=12;

②52÷(1-

1
2
×
7
10
)×
7
8

=52÷(1-

7
20
)×
7
8

=52÷

13
20
×
7
8

=52×

20
13
×
7
8

=70.

多项选择题
单项选择题 B1型题