Question

daca x supra y = 0,(3) calculati. 3x-y supra x+ y​

Answer 1

x/y = 0,(3)
0,(3) = 3/9 = 1/3
x/y = 1/3
⇒ x = y/3

(3x-y)/(x+y)
= [3(y/3)-y]/(y/3 + y)
= (y-y)/(4y/3)
= 0/(4y/3)
= 0