问题 解答题
脱式计算
15×
3
8
÷
9
4

3
10
-
3
10
÷6
7
13
×
3
8
+
5
8
÷
13
7

30×(
2
5
+
1
6
-
4
15
答案

(1)15×

3
8
÷
9
4

=15×(

3
8
×
4
9
),

=15×

1
6

=

5
2

(2)6÷

3
10
-
3
10
÷6,

=6×

10
3
-
3
10
×
1
6

=20-

1
20

=19

19
20

(3)

7
13
×
3
8
+
5
8
÷
13
7

=

7
13
×
3
8
+
5
8
×
7
13

=(

3
8
+
5
8
)×
7
13

=1×

7
13

=

7
13

(4)30×(

2
5
+
1
6
-
4
15
),

=30×

2
5
+30×
1
6
-30×
4
15

=12+5-8,

=17-8,

=9.

单项选择题
单项选择题