题目内容

下面各题,怎样简便就怎样算.
8
13
÷7+
1
7
×
6
13
=
1
2
×
2
5
+
9
10
÷
9
20
=
(
1
2
+
2
3
+
3
4
)×24=
7
1
3
÷[1
1
4
÷(4
2
3
-
1
2
)]=
2
9
+
1
2
÷
4
5
+
3
8
=
①
8
13
÷7+
1
7
×
6
13
,
=
8
13
×
1
7
+
1
7
×
6
13
,
=(
8
13
+
6
13
)×
1
7
,
=
14
13
×
1
7
,
=
2
13
;

②
1
2
×
2
5
+
9
10
÷
9
20
,
=
1
5
+
9
10
×
20
9
,
=
1
5
+2,
=2
1
5
;

③(
1
2
+
2
3
+
3
4
)×24,
=
1
2
×24+
2
3
×24+
3
4
×24,
=12+16+18,
=46;

④7
1
3
÷[1
1
4
÷(4
2
3
-
1
2
)],
=
22
3
÷[
5
4
÷
25
6
],
=
22
3
÷
3
10

=24
4
9
;

⑤
2
9
+
1
2
÷
4
5
+
3
8
,
=
2
9
+
5
8
+
3
8
,
=
2
9
+(
5
8
+
3
8
),
=
2
9
+1,
=1
2
9
.
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