頂點(diǎn)在原點(diǎn) 關(guān)于x軸對(duì)稱(chēng) 并經(jīng)過(guò)點(diǎn)M(5,-4)
設(shè)方程為y²=2px,則(-4)²=2p*5,解得p=8/5,所以方程為y²=16x/5
頂點(diǎn)在原點(diǎn),焦點(diǎn)是F(0,5) p/2=5,p=10,方程為y²=20x
頂點(diǎn)在原點(diǎn),準(zhǔn)線(xiàn)是x=4 -p/2=4,p=-8,方程為y²=-16x
焦點(diǎn)是F(0,-8),準(zhǔn)線(xiàn)是y=8 焦準(zhǔn)距16被原點(diǎn)平分,所以頂點(diǎn)在原點(diǎn),
設(shè)方程為x²=16y