题目内容

递等式计算(能简算的要简算)
1
3
+
4
9
+
1
5
+
5
9
(
5
8
-
5
12
)×24
2
3
-8÷8×
3
8
8
9
×[
3
4
-(
7
16
-
1
4
)]
1
3
÷
2
27
×(
5
6
-
3
4
)
6÷[
2
5
×(
4
5
-
1
20
)].
(1)
1
3
+
4
9
+
1
5
+
5
9
,
=(
1
3
+
1
5
)+(
5
9
+
4
9
),
=
8
15
+1,
=1
5
18
;

(2)(
5
8
-
5
12
)×24,
=
5
8
×24-
5
12
×24,
=15-10,
=5;

(3)
2
3
-8÷8×
3
8
,
=
2
3
-1×
3
8
,
=
2
3
-
3
8
,
=
7
24
;

(4)
8
9
×[
3
4
-(
7
16
-
1
4
)],
=
8
9
×[
3
4
-
3
16
],
=
8
9
×
9
16
,
=
1
2
;

(5)
1
3
÷
2
27
×(
5
6
-
3
4
),
=
1
3
÷
2
27
×
1
12
,
=
9
2
×
1
12
,
=
3
8
;

(6)6÷[
2
5
×(
4
5
-
1
20
)],
=6÷[
2
5
×
3
4
],
=6÷
3
10
,
=20.
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