1.
[tex]P = \frac{k}{r} | \times r \\ k = Pr | \div P \\ r = \frac{k}{P} [/tex]
Odp.C
2.
[tex]n = 0.8b | \div 0.8 \\ b = n \div 0.8 \\ b = n \times \frac{10}{8} \\ b = \frac{5}{4} n \\ b = 1.25n[/tex]
Odp.B
3.
[tex]P = \frac{ah}{2} | \times 2 \\ 2P = ah | \div a \\ h = \frac{2P}{a} [/tex]
Odp.D
