2x³+27/4=08x³+27=0(2x+3)(4x²-6x+9)=0x1=-3/24x²-6x+9=0x²-6x/4+9/4=0x²-3x/2=-9/4x²-3x/2+(3/4)²=-36/16+9/16(x-3/4)²=-27/16无实数解x-3/4=±3√3i/4x=3/4±3√3i/4
