x2 |
2 |
y2 |
4 |
A.y=-2x-1 | B.y=-
| C.y=-2x+3 | D.y=-
|
x1+x2 |
2 |
y1+y2 |
2 |
x12 |
2 |
y12 |
4 |
x22 |
2 |
y22 |
4 |
(x1-x2)(x1+x2) |
2 |
(y1-y2)(y1+y2) |
4 |
y1-y2 |
x1-x2 |
2(x1+x2) |
y1+y2 |
x2 |
m |
y2 |
8 |
|
A.(0,4] | B.[4,+∞) | C.(0,2] | D.[2,+∞) |
5 |
A.
| B.
| ||||||||
C.
| D.
|
x2 |
6 |
y2 |
2 |
A.x=-1 | B.x=-2 | C.x=-
| D.x=-4 |
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