9у2 - 30у + 25 = 0
D=(-30)^2-4*9*25=900-900=0
y1=(30+0)/2*9=30/18
y2=(30-0)/2*9=30/18
y=30/18=10/6=5/3
9у2 - 30у + 25 = 0
D=(-30)^2-4*9*25=900-900=0
y1=(30+0)/2*9=30/18
y2=(30-0)/2*9=30/18
y=30/18=10/6=5/3