题目内容

计算下列各题.
7
12
÷
2
3
×
4
7

(
5
7
+
1
2
)÷(
4
5
-
2
3
)
9
17
÷
4
3
+
3
4
×
8
17

3
4
÷(
1
2
-
3
8
)
45×(
4
9
+
7
15
)
(1)
7
12
÷
2
3
×
4
7
,
=
7
8
×
4
7
,
=
1
2
;

(2)(
5
7
+
1
2
)÷(
4
5
-
2
3
),
=
17
14
÷
2
15
,
=
255
28
;

(3)
9
17
÷
4
3
+
3
4
×
8
17
,
=
9
17
×
3
4
+
3
4
×
8
17
,
=(
9
17
+
8
17
)×
3
4
,
=1×
3
4
,
=
3
4
;

(4)
3
4
÷(
1
2
-
3
8
),
=
3
4
÷
1
8
,
=6;

(5)45×(
4
9
+
7
15
),
=45×
4
9
+45×
7
15
,
=20+21,
=41.
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