问题 解答题
脱式计算:
(1)(
3
4
+
5
6
-
2
3
)×24
(2)(
5
6
+
7
12
+
3
8
)÷
1
48

(3)(
1
3
-
1
6
)×(
5
8
÷
1
6

(4)
4
9
÷[
4
5
-(
1
3
-
1
5
)].
答案

(1)(

3
4
+
5
6
-
2
3
)×24

=

3
4
×24+
5
6
×
24-
2
3
×
24,

=18+20-16,

=22;

(2)(

5
6
+
7
12
+
3
8
)÷
1
48

=(

5
6
+
7
12
+
3
8
)×48,

=

5
6
×48+
7
12
×48+
3
8
×48,

=40+28+18,

=86;

(3)(

1
3
-
1
6
)×(
5
8
÷
1
6

=(

2
6
-
1
6
)×(
5
8
×6
),

=

1
6
×
15
4

=

5
8

(4)

4
9
÷[
4
5
-(
1
3
-
1
5
)]

=

4
9
÷[
4
5
-
5
15
-
3
15
)],

=

4
9
÷[
4
5
-
2
15
],

=

4
9
÷[
12
15
-
2
15
],

=

4
9
×
3
2

=

2
3

选择题
单项选择题