х^4+0,2х^3-0,35х^2=0
x^2(x^2+0.2x-0.35)=0
x^2=0 => x=0
x^2+0.2x-0.35=0
x₁+x₂=-0.2
x₁*x₂=-0.35
x₁=-0.7
x₂=0.5
Ответ: г) x=-0.7; x=0; x=0.5
60-2=58