问题 解答题
计算下列各题.
2
3
-
1
2
÷
3
4
×
4
5
(
2
3
-
1
2
3
4
×
4
5
2
3
-
1
2
)÷(
3
4
×
4
5
(
2
3
-
1
2
÷
3
4
4
5
答案

(1)

2
3
-
1
2
÷
3
4
×
4
5

=

2
3
-
1
2
×
4
3
×
4
5

=

2
3
-
8
15

=

2
15

(2)(

2
3
-
1
2
)÷
3
4
×
4
5

=

1
6
×
4
3
×
4
5

=

8
45

(3)(

2
3
-
1
2
)÷(
3
4
×
4
5

=

1
6
×
5
3

=

5
18

(4))(

2
3
-
1
2
÷
3
4
)×
4
5

=(

2
3
-
2
3
)×
4
5

=0.

单项选择题
单项选择题