bjr
a)
3/4 = (3x3)/(4/3) = 9/12
2/3 = (2x4)/3x4) = 8/12
5/6 = (5x2)/(6x2) = 10/12
b)
8/12 10/12
|___|___|___|___|___|___|___|___|___|___|___|___|
0 7/12 9/12 1
2/3 5/6
|___|___|___|___|___|___|___|___|___|___|___|___|
0 7/12 3/4 1
c)
chris : (3/4) x 210 = (3 x 210)/4 = 157,5 (km)
alberto : (2/3) x 210 = (2 x 210)/3 = 140 (km)
Roman : (7/12) x 210 = (7 x 210)/12 = 122,5 (km)
Thibaut : (5/6) x 210 = (5 x 210) / 6 = 175 (km)
