3 |
4 |
MN |
PQ |
|
| ||
|
|
Y |
X+2 |
Y |
X-2 |
Y2 |
X2-Y2 |
x2 |
4 |
y2 |
-4m |
x2 |
4 |
y2 |
-4m |
x2 |
4 |
y2 |
3 |
8k2 |
3+4k2 |
4k2-12 |
3+4k2 |
4k2 |
3+4k2 |
-3k |
3+4k2 |
1+k2 |
(x1+x2)2-4x1x2 |
12(k2+1) |
3+4k2 |
-3k |
3+4k2 |
1 |
k |
4k2 |
3+4k2 |
k2 |
3+4k2 |
k2 |
3+4k2 |
3
| ||
3+4k2 |
|PQ| |
|MN| |
| ||||
|
1 |
4 |
1-
|
1 |
k2+1 |
1 |
4 |
1-
|
1 |
4 |
|
| ||
|
|
1 |
4 |
2 |
|
3 |
x2 |
a2 |
y2 |
b2 |
3 |
2 |
| ||
2 |
x2 |
3 |
x2 |
7 |
y2 |
a |
A.0<a≤1 | B.0<a<7 | C.1≤a<7 | D.1<a≤7 |
© 2017-2019 超级试练试题库,All Rights Reserved.