题目内容

计算下面各题,能简算的要简算.
(1)
5
12
÷7÷
5
7

(2)
8
13
×
1
7
+
6
13
÷7
(3)4×
5
12
÷
5
9

(4)(0.8-
2
5
)÷(
2
9
+
1
3
)
(5)
2
3
÷(
2
3
-
1
6
)
(6)(
7
12
+
11
18
)÷
5
36
.
(1)
5
12
÷7÷
5
7
,
=
5
12
÷
(7×
5
7
),
=
5
12
÷
5,
=
1
12
;

(2)
8
13
×
1
7
+
6
13
÷7,
=(
8
13
+
6
13
)×
1
7
,
=
14
13
×
1
7
,
=
2
13
;

(3)4×
5
12
÷
5
9
,
=4×(
5
12
×
9
5
),
=4×
3
4
,
=4;

(4)(0.8-
2
5
)÷(
2
9
+
1
3
),
=0.4÷
5
9
,
=
18
25
;

(5)
2
3
÷(
2
3
-
1
6
),
=
2
3
÷
1
2
,
=1
1
3
;

(6)(
7
12
+
11
18
)÷
5
36
,
=
7
12
×
36
5
+
11
18
×
36
5
,
=
21
5
+
22
5
,
=8
3
5
.
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