Zad. 12
a)
[tex]L = 2a + 2b[/tex]
b)
[tex]L = 4 \cdot (x + 1) = 4x + 4[/tex]
c)
[tex]L = x + 2y + 2 \cdot 1 + 2 \cdot 2 = x + 2y + 2 + 4 =x + 2y + 6[/tex]
Zad. 13
a)
[tex]P = \frac{1}{2} \cdot p \cdot h = \frac{ph}{2}[/tex]
b)
[tex]P = 2n \cdot x = 2nx[/tex]
c)
[tex]P = 2k \cdot a = 2ak[/tex]
