问题 解答题
计算下面各题,能简算的要简算.
11
12
-
3
8
+
1
8
7
8
-(
1
17
-
1
8
5-
4
7
-
3
7
2
3
+(
3
5
-
1
2
15
16
-(
3
16
+
1
4
4
9
+
3
10
+
5
9
+
7
10
答案

11
12
-
3
8
+
1
8

=

13
24
+
1
8

=

2
3

7
8
-(
1
17
-
1
8

=

7
8
-
1
17
+
1
8

=

7
8
+
1
8
-
1
17

=1-

1
17

=

16
17

5-

4
7
-
3
7

=5-(

4
7
+
3
7
),

=5-1,

=4;

2
3
+(
3
5
-
1
2

=

2
3
+
1
10

=

23
30

15
16
-(
3
16
+
1
4

=

15
16
-
3
16
-
1
4

=

3
4
-
1
4

=

1
2

4
9
+
3
10
+
5
9
+
7
10

=(

4
9
+
5
9
)+(
3
10
+
7
10
),

=1+1,

=2.

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