4x³-3x+1=0x³+1+3X^3-3x(x+1)(x²-x+1)+3x(x²-1)=0(x+1)(x²-x+1)+3x(x+1)(x-1)=0(x+1)(x²-x+1+3x²-3x)=0(x+1)(4x²-4x+1)=0(x+1)(2x-1)²=0x=-1 或 x=1/2