x平方-4/x-2=0x³-4-2x=0x³-2x-4=0x³-2x²+2x²-4x+2x-4=0x²(x-2)+2x(x-2)+2(x-2)=0(x-2)(x²+2x+2)=0x1=2x²+2x+2=0x²+2x+1=-1(x+1)²=-1无实数解x+1=±ix2=-1+ix3=-1...