найдите корни уравнения: 1)26+5y-0.5y^2=2.5y^2+26
2)-7x^2+13x+9=-19+13x

1) 26+5y-0.5y^2=2.5y^2+2626+5y-0.5y^2-2.5y^2-26=05y-3y^2=0y(5-3y)=0y1=0 y2=1.662)-7x^2+13x+9=-19+13x-7x^2+13x+9+19-13x=0-7x^2+28=07x^2=28x^2=3x1=√3x2=-√3