题目内容

脱式计算
15×
3
8
÷
9
4

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

30×(
2
5
+
1
6
-
4
15
)
(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.
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