2/3 и 3
Объяснение:
arccos(3x²-10x+2.5)=2π/3
3x²-10x+5/2 = cos2π/3
3x²-10x+5/2 = -1/2
3x²-10x+3 = 0
D = 100-36 = 64
x ₁ ₂ = (10±8)6
x₁ = 2/3 x₂ = 3
2/3 и 3
Объяснение:
arccos(3x²-10x+2.5)=2π/3
3x²-10x+5/2 = cos2π/3
3x²-10x+5/2 = -1/2
3x²-10x+3 = 0
D = 100-36 = 64
x ₁ ₂ = (10±8)6
x₁ = 2/3 x₂ = 3