即A是P和P‘的中点设P(x,y)P'(a,b)则(x+a)/2=2(y+b)/2=3a=4-xb=6-yP'在y=x²+1所以b=a²+16-y=(4-x)²+1所以(x-4)²=-(y-5)
*-17=1/4*=17+1/4*=17又1/4
