x²-6x+p²-2p+5=0x1=2,代入4-12+p²-2p+5=0p²-2p-3=0(p-3)(p+1)=0p=3,p=-1p²-2p+5=12-4=8所以x²-6x+8=0(x-2)(x-4)=0x1=2,x2=4所以p=3,p=-1x2=4