问题 解答题
计算下面各题,能简算的要简算.
4
5
-
3
10
-
1
5
2
3
-(
5
12
-
1
4
11
12
-
3
10
+
1
12
-
7
10
1
4
-
1
8
+
5
6
19
16
-(
3
16
+
7
8
8
13
+
15
17
+
18
13
+
2
17
答案

(1)

4
5
-
3
10
-
1
5

=

8
10
-
3
10
-
2
10

=

3
10

(2)

2
3
-(
5
12
-
1
4
),

=

2
3
-
1
6

=

1
2

(3)

11
12
-
3
10
+
1
12
-
7
10

=(

11
12
+
1
12
)-(
3
10
+
7
10
),

=1-1,

=0;

(4)

1
4
-
1
8
+
5
6

=

1
8
+
5
6

=

23
24

(5)

19
16
-(
3
16
+
7
8
),

=

19
16
-
3
16
-
7
8

=1-

7
8

=

1
8

(6)

8
13
+
15
17
+
18
13
+
2
17

=(

8
13
+
18
13
)+(
15
17
+
2
17
),

=2+1,

=3.

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