Respostas

2014-01-07T01:14:44-02:00
Calcule valor de x :
a) 100x + 5 = 0,001
100x = 0,001 - 5
100x = - 4999
x = - 4999 ÷ 100
x = - 49,99

b) - 4x = 16 .
x = 16 ÷ (- 4)
x = - 4

c) 121 - x - 35 = 11.
- x = 11 - 121 + 35
- x = - 75
x = 75

d) (1/8) 2x = 0,125 
2x (1) = 0,125
      8
2x = 0,125
 8
2x = 8 * 0,125
2x = 1
x = 1 ÷ 2
x = 0,5

e) (- 3) 4x - 3 = (- 243) 
4x (- 3) - 3 = - 243
- 12x - 3 = - 243
- 12x = - 243 + 3
- 12x = - 240
x = - 240 ÷ (- 12)
x = 20

f) 1 - x - 35 = 0.
- x = 0 - 1 + 35
- x = 34
x = - 34
1 5 1