3x²-0,5x+1:-3 a=3 b=-0.5 c=⅓ Δ=b²-4*a*c=0.25+4=4.25 x₁=(0.5-√4.25)/2=0.25-½*√4,25 x₂=(0.5+√4.25)/2=0.25+½*√4,25