问题 解答题
计算下面各题:
4
5
-
1
3
)÷
2
15
2
5
×(
5
6
+
3
4
)-
1
5
1
3
÷
12
7
+
2
3
×
7
12
[
1
6
+(
1
2
-
1
3
)]÷2.
答案

(1)(

4
5
-
1
3
)÷
2
15

=

7
15
×
15
2

=

7
2

(2)

2
5
×(
5
6
+
3
4
)-
1
5

=

2
5
×
19
12
-
1
5

=

19
30
-
1
5

=

13
30

(3)

1
3
÷
12
7
+
2
3
×
7
12

=

1
3
×
7
12
+
2
3
×
7
12

=(

1
3
+
2
3
)×
7
12

=1×

7
12

=

7
12

(4)[

1
6
+(
1
2
-
1
3
)]÷2

=[

1
6
+
1
6
]÷2

=

1
3
×
1
2

=

1
6

多项选择题
单项选择题