5

2

9

-6

1

-7

(a)  

7

-4

8

-2

9

5

(a)  

9

3

-7

2

8

-4

(a)  

3

2

7

-4

9

6

(a)  

74

-6

23

-9

(a)  

6

28

-5

92

(a)  

8

41

76

-3

(a)  

66

5

-8

-29

(a)  

74

-6

2

51

(a)  

4

3

8

-1

9

-7

(a)  

7

-3

9

-6

1

4

(a)  

6

-2

8

1

-9

5

(a)  

6

3

9

2

-8

-4

(a)  

2

9

-5

1

8

-4

(a)  

92

4

-67

1

(a)  

9

81

-34

6

(a)  

72

9

-16

-4

(a)  

94

-8

6

-27

(a)  

7

19

-8

5

43

(a)