问题 解答题
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
答案

(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.

单项选择题
单项选择题