9,75:(4 1/2-2/55) = 9.75 : (4.5 - 0.03636) = 9.75 : 4.46364 = 2.18286
15,96:(9,25+2,04) = 15.96 : (11.29) = 1.41576
9,75:(4 1/2-2/55) = 9.75 : (4.5 - 0.03636) = 9.75 : 4.46364 = 2.18286
15,96:(9,25+2,04) = 15.96 : (11.29) = 1.41576