问题 解答题
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
=
答案

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

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

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

单项选择题
单项选择题