题目内容

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
(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.
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