题目内容

下面各题怎样算简便就怎样算.
7
9
-
7
9
÷7
2
3
×
8
5
+
1
3
÷
5
8
 
1
4
-
1
20
)×40
2-
3
8
÷
7
16
-
1
7
 
2
21
÷[(
3
4
-
2
3
)×
6
7
].
(1)7÷
7
9
-
7
9
÷7,
=9-
1
9

=8
8
9


(2)
2
3
×
8
5
+
1
3
÷
5
8

=
2
3
×
8
5
+
1
3
×
8
5

=(
2
3
+
1
3
)×
8
5

=1×
8
5

=
8
5


(3)(
1
4
-
1
20
)×40,
=
1
4
×40-
1
20
×40,
=10-2,
=8;

(4)2-
3
8
÷
7
16
-
1
7

=2-
6
7
-
1
7

=2-(
6
7
+
1
7
),
=2-1,
=1;

(5)
2
21
÷[(
3
4
-
2
3
)×
6
7
],
=
2
21
÷[
1
12
×
6
7
],
=
2
21
÷
1
14

=
4
3
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