问题 解答题
脱式计算:
(1)
4
9
÷[
4
5
-( 
1
5
+
1
3
)]
(2)
8
15
×
5
6
×
4
9

(3)
7
13
÷7+
1
7
×
6
13
 (要简算)
(4)
1
6
+
3
4
×
2
3
÷2.
答案

(1)

4
9
÷[
4
5
-(
1
5
+
1
3
)],

=

4
9
÷[
4
5
-
1
5
-
1
3
],

=

4
9
÷(
3
5
-
1
3
),

=

4
9
×
15
4

=

5
3

(2)

8
15
×
5
6
×
4
9

=

4
9
×
4
9

=

16
81

(3)

7
13
÷7+
1
7
×
6
13

=(

7
13
+
6
13
)×
1
7

=1×

1
7

=

1
7

(4)

1
6
+
3
4
×
2
3
÷2,

=

1
6
+
3
4
×
2
3
×
1
2

=

1
6
+
1
4

=

5
12

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