问题 解答题
脱式计算.
23-
8
9
×
3
8
÷
1
7
2
9
+
5
9
×
3
5
+
3
8
2-
6
17
÷
15
34
-
1
5
(4-3×
2
3
1
9
答案

(1)23-

8
9
×
3
8
÷
1
7

=23-

8
9
×
3
8
×7,

=23-

7
3

=20

2
3

(2)

2
9
+
5
9
×
3
5
+
3
8

=

2
9
+
1
3
+
3
8

=

16
72
+
24
72
+
27
72

=

67
72

(3)2-

6
17
÷
15
34
-
1
5

=2-

6
17
×
34
15
-
1
5

=2-

4
5
-
1
5

=2-(

4
5
+
1
5
),

=2-1,

=1;

(4)(4-3×

2
3
)÷
1
9

=(4-2)×9,

=2×9,

=18.

选择题
多项选择题