y^2=2px,准线是x=-p/2根据定义得，点A到焦点的距离＝点到准线的距离=xA+p/2=m+p/2=5m=5-p/2又2pm=3^2=9m=9/(2p)5-p/2=9/(2p)10p-p^2=9p^2-10p+9=0(p-1)(p-9)=0p1=1,p2=9故抛物线方程是y^2=2x或y^2=18x
