x/y=0.3/0.4.deci de la proportii rezulta0.4*x=0.3*y.deciy=0.4*x/0.3.deci inlocuind in suma:0.4*x/0.3+x=5.6.transf fractiile zecimale in periodice
4*x/3+x=56/10.aduci la ac numitor
(40x+30x)/30=168/30
70x=168
x=168/70=84/35
y=56/10-84/35.aduci la ac numitor sio faci calculele
