题目内容

计算下面各题,要求简算的写明简算依据.
1
2
+
1
4
-
1
6

2
3
-(
1
2
-
1
4

3
5
+
1
4
+
2
5

3-
1
4
-
1
3
-
3
4
(要简算)
(1)
1
2
+
1
4
-
1
6

=
3
4
-
1
6

=
7
12


(2)
2
3
-(
1
2
-
1
4
),
=
2
3
-
1
4

=
5
12


(3)
3
5
+
1
4
+
2
5

=(
3
5
+
2
5
)+
1
4

=1+
1
4

=1
1
4


(4)3-
1
4
-
1
3
-
3
4

=3-
1
3
-
1
4
-
3
4

=(3-
1
3
)-(
1
4
+
3
4
),
=2
2
3
-1,
=1
2
3
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