是x^2+54?是x²+5x+4吧(x-2)/(x²+5x+4)-(x-2)/(x²+5x+6)=0(x-1)[1/(x²+5x+4)-1/(x²+5x+6)]=0因为x²+5x+4≠x²+5x+6所以1/(x²+5x+4)-1/(x²+5x+6)≠0‘所以x-2=0x=2...