问题 解答题
递等式计算(能简便的要简便计算)
(1)
13
16
÷(
7
8
+
13
16

(2)
7
8
+(
1
4
-
1
5
)÷
1
4

(3)
4
9
×
[
3
4
-(
7
16
-
1
4
)].
答案

(1)

13
16
÷(
7
8
+
13
16

=

13
16
÷(
14
16
+
13
16
),

=

13
16
÷
27
16

=

13
16
×
16
27

=

13
27

(2)

7
8
+(
1
4
-
1
5
)÷
1
4

=

7
8
+(
5
20
-
4
20
)×4,

=

7
8
+
1
20
×4,

=

7
8
+
1
5

=

35
40
+
8
40

=

43
40

(3)

4
9
×[
3
4
-(
7
16
-
1
4
)]

=

4
9
×[
3
4
+
1
4
-
7
16
],

=

4
9
×
9
16

=

1
4

单项选择题
单项选择题