设抛物线:y^2=2px,则:p=c
(2√10/3)^2=2p*2/3
p=10/3
抛物线方程:y^2=20x/3
(2/3)^2/a^2+(2√10/3)^2/b^2=1
4/a^2+40/b^2=9
a^2-b^2=c^2=p^2=100/9
解方程组得:
a^2=...,b^2=...
便可得椭圆方程
设抛物线:y^2=2px,则:p=c
(2√10/3)^2=2p*2/3
p=10/3
抛物线方程:y^2=20x/3
(2/3)^2/a^2+(2√10/3)^2/b^2=1
4/a^2+40/b^2=9
a^2-b^2=c^2=p^2=100/9
解方程组得:
a^2=...,b^2=...
便可得椭圆方程