Odpowiedź:
a) s = 18/50 = 36/100
b = 9/10
pole = a * b, więc a = pole / b
a = 36/100 : 90/100 = 36/100 * 100/90 = 36/90 = 4/10 = 0,4
b)s = 9 i 4/5 = 49/5
a = 2 i 4/5 = 14/5
pole = a * b, więc b = pole / a
b = 49/5 : 14/5 = 49/5 * 5/14 = 49/14 = 7/2 = 35/10 = 3,5
