问题 解答题
计算,能简算的尽可能简算
8
15
-
3
8
+
7
15
-
5
8
7
17
+
1
3
+
10
17
5
6
-(
2
7
-
1
6
)
1
5
+(
5
6
-
7
12
)
13
16
-
1
8
-
3
8
1
4
+
2
3
-
1
4
+
2
3
答案

(1)

8
15
-
3
8
+
7
15
-
5
8

=(

8
15
+
7
15
)-(
3
8
+
5
8
),

=1-1,

=0;

(2)

7
17
+
1
3
+
10
17

=(

7
17
+
10
17
)+
1
3

=1+

1
3

=

4
3

(3)

5
6
-(
2
7
-
1
6
),

=

5
6
-
2
7
+
1
6

=(

5
6
+
1
6
)-
2
7

=1-

2
7

=

5
7

(4)

1
5
+(
5
6
-
7
•12
),

=

1
5
+
1
4

=

9
20

(5)

13
16
-
1
8
-
3
8

=

13
16
-(
1
8
+
3
8
),

=

13
16
-
1
2

=

5
16

(6)

1
4
+
2
3
-
1
4
+
2
3

=(

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

=

4
3

单项选择题
单项选择题