Odpowiedź:
zad12
y% -procent podwyżki
x- cena komputera po podwyżce
[tex]8000+8000*y =x\\[/tex]
[tex]8000y = x-8000[/tex]
[tex]\\y= \frac{x-8000}{8000}[/tex]
[tex]\\\frac{y}{100} = \frac{x-8000}{8000}*100[/tex]
[tex]y = \frac{x-8000}{80}[/tex]%
Zad13
[tex]4n + (4n-2) + (4n-4) + (4n-6) = 16n-12 = 4(4n-3)[/tex]
c.n.d.
