问题 解答题
脱式计算.
4
9
÷(
2
3
-
2
5
)÷
1
3
2
15
+(
1
5
-
1
6
)〕÷
4
5
答案

(1)

4
9
÷(
2
3
-
2
5
)÷
1
3

=

4
9
÷(
10
15
-
6
15
)÷
1
3

=

4
9
÷
4
15
÷
1
3

=

4
9
×
15
4
×3,

=5;

(2)〔

2
15
+(
1
5
-
1
6
)〕÷
4
5

=〔

2
15
+(
6
30
-
5
30
)〕÷
4
5

=〔

2
15
+
1
30
〕÷
4
5

=〔

4
30
+
1
30
〕÷
4
5

=

1
6
÷
4
5

=

1
6
×
5
4

=

5
24

问答题 论述题
单项选择题