题目内容

计算.
3
4
-
4
15
×
5
8
2
15
×
5
6
+
13
6
×
2
15
(
5
6
+
2
3
)÷(
4
5
-
1
2
)
3
5
÷(
4
5
+
5
8
×
2
5
)
(1)
3
4
-
4
15
×
5
8

=
3
4
-
1
6

=
7
12


(2)
2
15
×
5
6
+
13
6
×
2
15

=
2
15
×
5
6
+
13
6
),
=
2
15
×
3,
=
2
5


(3)(
5
6
+
2
3
)÷(
4
5
-
1
2
)

=
9
6
÷
3
10

=5;

(4)
3
5
÷(
4
5
+
5
8
×
2
5
)

=
3
5
÷(
4
5
+
1
4
)

=
3
5
÷
21
20

=
4
7
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