解:∵ x²-3=0 ∴ x²=3,x=±√3 ∴ (2x-1)²+(x+2)(x-2)-(x^5-4x^4)+x³=4x²-4x+1+x²-4-x(x²)²+4(x²)²+xx² =4×3-4x+1+3-4-x×3×3+4×3×3+3x=48-10x=48±10√3
48-10根号3