Sabendo que U = Z, resolva as equações.
a) -40 = -10x
b) 3x = -45 - 2x
c) 6(x + 3) - 2(x - 5) = 20
d) -18 = 2x + 15
e) 2(x - 1) - 1= 8
f) 2(x - 7) – 4(5 - x) = 2
Respostas
Sabendo que U = Z, resolva as equações.
a) - 40 = - 10x
10x = 40
x = 40/10
x = 4
b) 3x = - 45 - 2x
3x + 2x = - 45
5x = - 45
x = - 45/5
x = - 9
c) 6(x + 3) - 2(x - 5) = 20
6x + 18 - 2x + 10 = 20
6x - 2x + 18 + 10 = 20
4x + 28 = 20
4x = 20 - 28
4x = - 8
x = - 8/4
x = - 2
d) - 18 = 2x + 15
- 2x = 15 + 18
- 2x = 33 · (- 1)
2x = - 33
x = - 33/2
e) 2(x - 1) - 1= 8
2x - 2 - 1 = 8
2x - 3 = 8
2x = 8 + 3
2x = 11
x = 11/2
f) 2(x - 7) - 4(5 - x) = 2
2x - 14 - 20 + 4x = 2
2x + 4x - 14 - 20 = 2
6x - 34 = 2
6x = 2 + 34
6x = 36
x = 36/6
x = 6
Oi...
Resolva as equações.:
a)
- 40 = - 10x
10x = 40
x = 40/10
x = 4
b)
3x = -45 - 2x
3x + 2x = - 45
5x = - 45
x = - 45/5
x = - 9
c)
6(x + 3) - 2(x - 5) = 20
6x + 18 -2x + 10 = 20
4x + 28 = 20
4x = 20 - 28
4x = - 8
x = - 8/4
x = - 2
d)
- 18 = 2x + 15
- 2x = 15 + 18
- 2x = 33⇒(- 1)
2x = - 33
x = - 33/2
e)
2(x - 1) - 1 = 8
2x - 2 - 1 = 8
2x - 3 = 8
2x = 8 + 3
2x = 11
x = 11/2
f)
2(x - 7) - 4(5 - x) = 2
2x - 14 - 20 + 4x = 2
6x - 34 = 2
6x = 2 + 34
6x = 36
x = 36/6
x = 6
Espero ter colaborado.