Odpowiedź:
a) P = a * h
3 * 4 = a * 5
12 = 5a / :5
a = [tex]\frac{12}{5}=2\frac{2}{5}[/tex]
b) 5 * 9 = 7 * b
45 = 7b /:7
b = [tex]\frac{45}{7}=6\frac{3}{7}[/tex]
c) 3 * 5 = 2 * c
15 = 2c
c = [tex]\frac{15}{2}=7\frac{1}{2}[/tex]
