Решите уравнения:
1) y:1 5/31=7 3/4:1/3
2) 2+х/5=4/9

х * 1/3 = 7 3/4 * 1 5/31х * 1/3 = 31/4 * 36 /31х * 1/3 = 12/31х = 12/31*3 = 36/31 = 1 5/31

у:1 5/31=7 3/4:1/31/3 у=1 5/31*7 3/41/3 у=36/31*31/41/3 у=9у=9:1/3у=272+х/5=4/9х/5=4/9-2х/5=-1 5/9х/5=-14/9х=-14/9*5х=-70/9х=-7 7/9