问题 解答题
用你喜欢的方法计算
(1)
1
2
-
1
12
-
5
12
(2)
19
20
+
3
11
-
19
20
(3)
5
16
+
6
8
-
5
32
(4)
15
16
-(
7
16
+
1
4
)+
1
4
答案

(1)

1
2
-
1
12
-
5
12

=

1
2
-(
1
12
+
5
12
),

=

1
2
-
1
2

=0’

(2)

19
20
+
3
11
-
19
20

=

19
20
-
19
20
+
3
11

=0+

3
11

=

3
11

(3)

5
16
+
6
8
-
5
32

=

17
16
-
5
32

=

29
32

(4)

15
16
-(
7
16
+
1
4
)+
1
4

=

15
16
-
7
16
-
1
4
+
1
4

=(

15
16
-
7
16
)-(
1
4
-
1
4
),

=

1
2
-0,

=

1
2

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