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<strong>Matemática</strong> básica<br />
R:<br />
<strong>Matemática</strong><br />
PV-13-14<br />
45. D<br />
46. A<br />
47. D<br />
48. B<br />
49. E<br />
50. A<br />
51.<br />
a. x<br />
2<br />
52. E = 3<br />
1 2<br />
+ = t − 2<br />
2<br />
x<br />
b. x 3 + x –3 = t 3 – 3t<br />
53. (A + B) 2 = 4x 4 + 8 + 4 x 4<br />
54. E<br />
55. x<br />
56. B<br />
2<br />
1 2<br />
+ = b − 2<br />
2<br />
x<br />
57. a + b + c = 12<br />
58. C<br />
59. B<br />
60. D<br />
CAPÍTULO 03<br />
61.<br />
62.<br />
63. C<br />
64. A<br />
x + y<br />
x − y<br />
a. (5x + 7) 2<br />
b. (x – 1) 2<br />
c. a · (a – 5) 2<br />
d. 6.245.001<br />
65. a. (a – 2) · (a 2 + 2a + 4)<br />
b. (x + 1) · (x 2 – x + 1)<br />
c. (x + 1) · (x 2 + x +1)<br />
66. a. a 2<br />
+ a + 1<br />
a + 1<br />
m + n<br />
b.<br />
m<br />
c. 1<br />
67. a 3 + 1 3<br />
a = 18<br />
68.<br />
a. x 4 – y 4 = (x 2 – y 2 ) (x 2 + y 2 ) = (x 2 + y 2 )(x – y)(x + y)<br />
b. (a + b) 2 – c 2 = (a + b + c) (a + b – c)<br />
c. 4a 2 – 49b 2m = (2a – 7b m ) (2a + 7b m )<br />
d. (x + 3) 2 – (3x – 4) 2 = (x + 3 + 3x – 4) (x + 3 – 3x + 4) = (4x – 1) · (7 – 2x)<br />
69. a. (x + y) · (x + 2y + 1)<br />
b. (2a + 3b) · (2a – 3b)<br />
c. 4xy<br />
d. (x 2 + y 2 ) · (x + y) · (x – y)<br />
e. 6.249.999<br />
70. a. 2ab 2 · (3a 3 c + 4a 2 b 3 – 6bc 2 )<br />
b. (a + b) · (x + 2)<br />
c. (2 + a) · (x + y)<br />
d. (x + 1) · (x 2 – 3)<br />
e. (x – 2) · (x – 3)<br />
71. C<br />
72. E<br />
73. A<br />
74. A<br />
75. E<br />
76. C<br />
77. E<br />
78. A<br />
79. B<br />
80. x = 4, x ∈ <br />
CAPÍTULO 04<br />
81. a. 0,46<br />
b. 675<br />
82.<br />
83. C<br />
84. E<br />
85. B<br />
a. 0,64<br />
b. 1,427<br />
c. 0,0037<br />
d. 1,35<br />
e. 104%<br />
f. 80%<br />
103
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