3x³-7x²-7x+3=0
3(x³+1)-7x(x+1)=0
3(x+1)(x²-x+1)-7x(x+1)=0
(x+1)(3x²-3x+3-7x)=0
(x+1)(3x²-10x+3)=0
x+1=0 или 3x²-10x+3 = 0
х₁ = -1, х₂·х₃ = 3/3=1
Значит, х₁· х₂· х₃ = -1·1 = -1.
3x³-7x²-7x+3=0
3(x³+1)-7x(x+1)=0
3(x+1)(x²-x+1)-7x(x+1)=0
(x+1)(3x²-3x+3-7x)=0
(x+1)(3x²-10x+3)=0
x+1=0 или 3x²-10x+3 = 0
х₁ = -1, х₂·х₃ = 3/3=1
Значит, х₁· х₂· х₃ = -1·1 = -1.