5

-4

5

2

4

6

(a)  

8

5

4

3

2

7

(a)  

6

9

6

-9

5

3

(a)  

2

-1

3

4

-5

8

(a)  

87

5

-43

8

(a)  

2

69

-4

97

(a)  

42

-6

54

8

(a)  

90

6

4

33

(a)  

5

68

-7

54

(a)  

6

5

4

-3

2

-1

(a)  

4

6

9

8

7

5

(a)  

7

-3

4

7

8

2

(a)  

3

9

4

-6

7

8

(a)  

6

4

-3

2

3

4

(a)  

79

6

-53

7

(a)  

69

8

6

54

(a)  

79

8

-34

2

(a)  

57

5

77

-8

(a)  

53

2

68

7

(a)