26. 27. 28.
29. 30. 31.
32. 33. 34.
Perform the indicated operations. See Example 4.
47. 48.
49.|- 11 |-|- 5 |-| 7 |+|- 2 | 50.|- 6 |+|- 3 |-| 4 |-|- 8 |
7
5
- a
9
10
-
3
2
- b
3
4
- a
1
2
-
3
8
ba-5
8
+
1
4
b -a-1
4
a- b5
4
-
2
3
b +1
6
- 0.382+ 4 - 0.6 3 - 2.95- 1 - 0.63 2
- 8 - 1 - 122 - 12 - 62 - 3 + 1 - 142 + 1 - 6 + 42
- 9 - 4 - 1 - 32 + 6 - 10 - 6 - 1 - 122 + 9
6 - 1 - 22 + 8 7 - 1 - 42 + 11
- 7 + 5 - 9 - 12 + 14 - 18
- |- 5 + 6 | - 2 - |- 4 | 16 - |- 13 |
|- 8 - 6 | |- 7 - 15 | -|- 4 + 9 |
3
14
- a-
3
4
b9
10
- a-
4
3
- 15.88- 1 - 9.42 2 b
SECTION 1.2 Operations on Real Numbers 21
51.Aand B 52.Aand C 53.Dand F 54.Eand C
55.A statement that is often heard is “Two negatives give a positive.” When is this true?
When is it not true? Give a more precise statement that conveys this message.
56.Explain why the reciprocal of a nonzero number must have the same sign as the number.
Multiply. See Example 6.
65. 66. 67. 68.
69. 70. 71. 72.
Divide where possible. See Example 7.
78. 79. 80. 81. 82.
83. 84. 85. 86.
87. 88. 89. 90.
- 60
- 0.06
- 100
- 0.01
- 162.9
36.2
- 27.72
13.2
7
6- 1
30
12
13- 4
3
-
22
23
,a-33
5
- b
10
17
,a-12
5
b13
0
5
0
0
- 14
0
- 8
150
- 30
100
- 25
- 45
- 9
- 24
- 4
- 39
13
- 14
2
- 2.4 1 - 2.45 2 - 3.45 1 - 5.14 2 3.4 1 - 3.14 2 5.66 1 - 6.1 2
-
2
11
a-77
4
- b
3
8
a-24
9
- b
9
7
a-21
36
- b
5
2
a-12
25
b3
5
1 - 352
3
4
- 1 - 162
1
2
- 10 a- 1 - 182
1
5
b51 - 72 61 - 92 - 81 - 52 - 201 - 42
The number line has several points labeled. Find the distance between each pair of points.
See Example 5.
–6 –5 –4 –3 0 1 2 345 6D A E F BC
1
23- 2