题目内容

计算下面各题,注意使用简便算法.
(1)
2
9
+
1
2
÷
4
5
+
3
8

(2)[1-(
1
4
+
3
8
)]÷
1
4
(3)2-
6
13
÷
9
26
-
2
3
(4)
8
13
÷7+
1
7
×
6
13
(1)
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


(2)[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
1
4

=
3
8
÷
1
4

=
3
2


(3)2-
6
13
÷
9
26
-
2
3

=2-
4
3
-
2
3

=2-(
4
3
+
2
3
),
=2-2,
=0;

(4)
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
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