题目
题型:不详难度:来源:
答案
c |
a |
1 |
2 |
∴c=1,
∴b2=a2-c2=3.
∴椭圆方程为
x2 |
4 |
y2 |
3 |
(2)当椭圆的焦点在y轴上时,∵b=2,
c |
a |
1 |
2 |
∴
| ||
a |
1 |
2 |
16 |
3 |
故椭圆的方程为
y2 | ||
|
x2 |
4 |
综上知,所求椭圆的方程为
x2 |
4 |
y2 |
3 |
y2 | ||
|
x2 |
4 |
故答案为:
x2 |
4 |
y2 |
3 |
y2 | ||
|
x2 |
4 |
核心考点
举一反三
c |
a |
1 |
2 |
x2 |
4 |
y2 |
3 |
c |
a |
1 |
2 |
| ||
a |
1 |
2 |
16 |
3 |
y2 | ||
|
x2 |
4 |
x2 |
4 |
y2 |
3 |
y2 | ||
|
x2 |
4 |
x2 |
4 |
y2 |
3 |
y2 | ||
|
x2 |
4 |