问题 解答题
计算题:
(1)[(
2
3
-
1
4
)÷
5
6
+
4
5
5
11

(2)(
3
8
+
5
6
-
7
12
)×24
(3)
9
20
÷[
1
2
×(
2
5
+
4
5
)]
(4)
2
3
+(
1
2
+
2
3
)×
2
7
答案

(1)[(

2
3
-
1
4
)÷
5
6
+
4
5
5
11

=[

5
12
÷
5
6
+
4
5
5
11

=[

1
2
+
4
5
5
11

=

13
10
×
5
11

=

13
22

(2)(

3
8
+
5
6
-
7
12
)×24,

=(

29
24
-
7
12
)×24,

=

15
24
×24,

=15;

(3)

9
20
÷[
1
2
×(
2
5
+
4
5
)],

=

9
20
÷[
1
2
×
6
5
],

=

9
20
÷
3
5

=0.75;

(4)

2
3
+(
1
2
+
2
3
)×
2
7

=

2
3
+
7
6
×
2
7

=

2
3
+
1
3

=1.

单项选择题
单项选择题