问题 解答题
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)
答案

(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

单项选择题
单项选择题