题目内容

计算下面各题
3
5
-
2
5
×
1
3
(
7
8
+
1
4
)÷
21
32
105×(
1
3
+
1
5
+
1
7
)
5
7
÷
3
14
-
2
7
÷
3
14
.
(1)
3
5
-
2
5
×
1
3

=
3
5
-
2
15
,
=
7
15
;
(2)(
7
8
+
1
4
)÷
21
32

=
36
32
×
32
21
,
=
12
7
;
(3)105×(
1
3
+
1
5
+
1
7
)
=105×
1
3
+105×
1
5
+105×
1
7
,
=35+21+15,
=71;
(4)
5
7
÷
3
14
-
2
7
÷
3
14
.
=
5
7
×
14
3
-
2
7
×
14
3
,
=
10
3
-
4
3
,
=2.
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