9.19 19

© 2009 Chung Tai Educational Press. All rights reserved.

Build-up Exercise 9A (page 9.9) 1. (a)

a41 (b)

x7 (c)

cd1

2. (a) b31 (b)

xy4 (c)

24rpq

3. (a) )(3

1yx −

(b) 2)( cb

a+

(c) qnm

3−

4. (a) qp 4

2−

(b) 35+n (c)

bab−32

5. (a) baab32

3−+ (b)

21

− (c) 52z

6. (a) ba (b)

2p

− (c) 4

1 x+

7. (a) 25y (b)

21 (c)

31q

8. (a) ba28 (b) 3 (c) 23d

9. (a) b2 (b)

101

− (c) yx23

−

10. (a) 2xy (b)

81

− (c) ab21

11. (a) c (b) q3 (c)

231y

12. (a) ))(( yxba ++ (b) 3a

13. (a) )1)(1( ba ++ (b) ba+

−1

Build-up Exercise 9B (page 9.11) 14. (a) 7 (b) 1 (c) −5 (d) −3

15. (a) x2

− (b) y5

(c) z3

− (d) ba14

16. (a) ba +

9 (b) yx

x+− 32

(c) 2 (d) −1

17. (a) h21 (b)

a47

(c) c

b329 + (d)

hk35

−

18. (a) c2021 (b)

a611

(c) a

x24

2015 − (d) vu

1511

19. (a) 8 (b) 4b (c) 12 −d (d) gf 2+

20. (a) nm −7

9 (b) 1

(c) 1

2−ww (d) 1

21. (a) )3(4

11x+

(b) )(2

13ba +

(c) )6(5

14−xx (d)

)(21

bab+−

22. (a) )(6

1yx +

− (b) )11(12

83+

+h

h

(c) )5(20

45−+

mm (d)

)2(24316yxxy

−+

23. (a) x

x21− (b)

yy

692 −

(c) )12(3

3−

−zz (d)

baba

351010

−−

24. (a) (i) )8(

8++xxx (ii)

)8( +xxx

(b) )8(

8+xx

Build-up Exercise 9C (page 9.13) 25. (a) 15 (b) 36

(c) 23 (d)

121

26. (a) 21 (b) 4

(c) 8 (d) 4

27. 41

− 28. 225

29. 90 30. 16

31. 80.08 32. 2

33. 33 34. 8

35. 100 36. 59

37. 5 38. 9.8

39. −2 40. 65

−

41. 23

42. (a) a121 (b) 20

43. (a) 471 (b) 4

44. (a) (i) 4 (ii) 12 cm (b) (i) 9 (ii) 49 cm

9.20

© 2009 Chung Tai Educational Press. All rights reserved.

45. (a) 400 (b) 1 600 (c) 1 220

46. (a) 32 (b) (i) 212°F (ii) 78.5°C (c) Yes

Build-up Exercise 9D (page 9.16) 47. (a) O (b) P (c) O (d) O

48. (a) bcda −= (b) cadb −

=

(c) badc −

=

49. (a) yxz −−= 360 (b) 52yx =

50. (a) 32+

=yx (b)

683 −

=yx

51. (a) 74 += ab (b) 346 pq −

=

52. (a) 36nm = (b)

32pq =

53. (a) babc −

=2

(b) ttusv −

=2

54. (a) 816−

=yx (b)

xxyz

3−

=

55. (a) vu

Pm+

= (b) 113

9+

=ffe

56. (a) bebcad −

= (b) 621+

=pq

57. (a) y

x121

−= (b) )14(3

22 −

=bba

58. (a) bfdTeTca +−−+= (b) bca

Se −+

=

59. (a) 221+−

=w

wr (b) 1

2

−=mmn

60. (a) 4

4+

=x

t (b) 2)4(

64+

=x

y

61. (a) (i) 2

1−−

=xxa (ii)

21

−−

=yya

(b) xxy2334

−−

= (c) yyx2334

−−

=

62. (a) xyxy −

(b) (i) Axxy−

=1

(ii) 81

−

60. (a) $5 400 (b) PPAT

02.0−

=

(c) 10 years