k₁ + k₂ m₁ k₂ - w²) X₁ X₁ + m2 X2 = 0 (k₂+ k3 k3 w² X₂ -X3 = 0 m2 m2 k3 k3 X2 + w² X3 = 0 m3 m3 m3 = 8000 kg m m₂ = 10,000 kg m m₁ = 12,000 kg эт k3=1800 kN/m k₂-2400 kN/m k₁ =3000 kN/m