Odpowiedź:
Szczegółowe wyjaśnienie:
1.
a)
2(3x + 4) = 8
6x + 8 = 8 | -8
6x = 0
x = 0
b)
3(2 - 5x) = -9
6 - 15x = -9 | -6
-15x = -15 | : (-15)
x = 1
c)
3(x - 2) = 2(2 - x)
3x - 6 = 4 - 2x | + 2x
5x - 6 = 4 | +6
5x = 10 | :5
x = 2
d)
4(x - 2) = x + 1
4x - 8 = x + 1 | -x
3x - 8 = 1 | +8
3x = 9 | : 3
x = 3
2.
x = wzrost Huberta
x + 8cm = wzrost Tomka
[tex]\frac{2x + 8}{2} = 175cm\\[/tex]
x + 4 = 175 | -4
x = 171
wzrost Huberta = 171
wzrost Tomka = 179
