题目内容

5
8
÷
20
21
÷
7
12
3
4
×(
17
18
-
5
9
4×[(
5
6
+
2
3
)÷6]
3
7
×
1
15
+
4
7
÷15
(6-
1
8
×32)+
3
4
4
5
÷
5
8
-
1
2
÷
5
8
5
8
÷
20
21
÷
7
12

=
5
8
×
21
20
×
12
7

=
9
8


3
4
×(
17
18
-
5
9

=
3
4
×(
17
18
-
10
18
),
=
3
4
×
7
18

=
7
24


4×[(
5
6
+
2
3
)÷6]
=4×[(
5
6
+
4
6
)×
1
6
],
=4×[
9
6
×
1
6
],
=4×
1
4

=1;

3
7
×
1
15
+
4
7
÷15
=
3
7
×
1
15
+
4
7
×
1
15

=(
3
7
+
4
7
)×
1
15

=1×
1
15

=
1
15


(6-
1
8
×32)+
3
4

=(6-4)+
3
4

=2+
3
4

=2
3
4


4
5
÷
5
8
-
1
2
÷
5
8

=
4
5
×
8
5
-
1
2
×
8
5

=(
4
5
-
1
2
)×
8
5

=(
8
10
-
5
10
)×
8
5

=
3
10
×
8
5

=
12
25
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