题目
题型:不详难度:来源:
x2 |
27 |
y2 |
36 |
15 |
(2)椭圆过两点(
6 |
3 |
2 |
答案
x2 |
27 |
y2 |
36 |
36-27 |
设双曲线方程为
y2 |
a2 |
x2 |
9-a2 |
∵双曲线过(
15 |
16 |
a2 |
15 |
9-a2 |
而a2<9,
∴a2=4,
∴双曲线方程为
y2 |
4 |
x2 |
5 |
(2)设椭圆方程为Ax2+By2=1(A>0,B>),则
|
1 |
9 |
1 |
3 |
∴所求椭圆方程为
x2 |
9 |
y2 |
3 |
核心考点
举一反三
x2 |
27 |
y2 |
36 |
15 |
6 |
3 |
2 |
x2 |
27 |
y2 |
36 |
36-27 |
y2 |
a2 |
x2 |
9-a2 |
15 |
16 |
a2 |
15 |
9-a2 |
y2 |
4 |
x2 |
5 |
|
1 |
9 |
1 |
3 |
x2 |
9 |
y2 |
3 |