题目内容

下面各题怎样简便就怎样算.
(1)
3
4
×
7
12
÷
14
9
(2)24×(
1
4
+
5
6
(3)3-
3
2
÷
21
10
-
2
7
(4)
3
4
×
1
7
+
1
4
÷7
(5)
1
5
÷[
1
13
×(
1
5
+
2
3
)].
(1)
3
4
×
7
12
÷
14
9

=
3
4
×
7
12
×
9
14

=
9
32


(2)24×(
1
4
+
5
6
),
=24×
1
4
+
5
6
×24,
=6+20,
=26;

(3)3-
3
2
÷
21
10
-
2
7

=3-
3
2
×
10
21
-
2
7

=3-
5
7
-
2
7

=3-(
5
7
+
2
7
),
=3-1,
=2;

(4)
3
4
×
1
7
+
1
4
÷7,
=
3
4
×
1
7
+
1
4
×
1
7

=(
3
4
+
1
4
)×
1
7

=1×
1
7

=
1
7


(5)
1
5
÷[
1
13
×(
1
5
+
2
3
)],
=
1
5
÷[
1
13
×
13
15
],
=
1
5
÷
1
15

=
1
5
×15,
=3.
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