Odpowiedź:
zad. 119.
a)
3x = 72
x = 24
b)
[tex]\frac{x}{2} = 5[/tex]
x = 10
c)
1 + 4x = 2
4x = 1
x = 0,25
d)
15 - 2x = - 3
- 2x = - 18
x = 9
zad. 120.
a)
[tex]\frac{x + 1}{3} = 7[/tex]
x + 1 = 21
x = 20
b)
[tex]\frac{3 - x}{2} = \frac{1}{3}[/tex]
[tex]3 - x = \frac{2}{3}[/tex]
[tex]- x = - \frac{7}{3}[/tex]
[tex]x = \frac{7}{3}[/tex]
c)
[tex]1 - 3x = \frac{1}{2}[/tex]
2 - 6x = 1
6x = -1
[tex]x = -\frac{1}{6}[/tex]
d)
[tex]\frc{1}{2}x + 1 = 4[/tex]
12x = 3
x = 0,25
