Page 263 - Basic College Mathematics with Early Integers

240 C HAPTE R 3 I FRACTIONS

2 7 4 1 1 2 1
#
20. a- - b , 21. 2 a + b + 2 22. # a5 - b - 1
3 3 9 4 5 5 2
3 2 3 1 8 2 2 2 3 2
23. a b , a - b 24. a b , a2 - b 25. a - b
4 4 12 9 3 5 10

3 4 3 3 1 2 1 1 1 1 3 2 3 2
26. a - b 27. a + b - a + b 28. a + b + a # b
2 3 4 8 2 8 6 3 5 4

1 2 5
Objective Evaluate each expression if x =- , y = , and z = . See Example 7.
3 5 6
x
29. 5y - z 30. 2z - x 31.
z

y + x
2
2
32. 33. x - yz 34. x - z 2
z
35. (1 + x)(1 + z) 36. (1 - x)(1 - z)

Objectives Mixed Practice Simplify the following. See Examples 1 through 6.

5 7
24 10 3 3 1 3
37. 38. 39. a b + a b
1 14 2 2
12 25

5 1 1 1 1 2 1 3 2 3
40. a , b + a # b 41. a- b + 42. a- b +
21 2 7 3 2 5 4 8

1 1
2 + 3 - 2
6 2 2
43. 44. 45. a1 - b
4 1 5
1 - 4 +
3 5

1 2 3 2 3 1 1 1 3 1
46. a- b - a b 47. a - 1ba + b 48. a + ba - 1b
2 4 4 8 2 10 20 5

1 5
2 7 4 5 2 2 3 - 6
49. a- - b 50. a - b 51.
9 9 9 3 3 1
+
4 2

7 1
+
10 2 3 6 3 6 1 2 1 2 Copyright 2012 Pearson Education, Inc.
52. 53. a , b - a # b 54. a # b - a , b
4 3 4 5 4 5 2 7 2 7
+
5 4