题目内容

8
13
÷7+
1
7
×
6
13
1
6
×
2
3
÷(
4
5
-
8
15
[
1
2
-(
3
4
-
3
5
)]÷
7
10
3-
3
14
×2-
4
7
(1)
8
13
÷7+
1
7
×
6
13

=
8
13
×
1
7
+
1
7
×
6
13

=(
8
13
+
6
13
)×
1
7

=
14
13
×
1
7

=
2
13


(2)
1
6
×
2
3
÷(
4
5
-
8
15
),
=
1
6
×
2
3
÷
4
15

=
1
9
×
15
4

=
5
12


(3)[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-
3
20
7
10

=
7
20
÷
7
10

=
1
2


(4)3-
3
14
×2-
4
7

=3-
3
7
-
4
7

=3-(
3
7
+
4
7
),
=3-1,
=2.
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