试题:
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:

我来补答
(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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