17 |
|
5 |
17 |
R2-(
|
5-
|
| ||
2 |
|0-1+1-m| | ||
|
| ||
2 |
3 |
3 |
3 |
3 |
3 |
2m2 |
1+m2 |
m2-5 |
1+m2 |
y1 |
x1 |
y2 |
x2 |
y1x2+y2x1 |
x1x2 |
(mx1-m+1)x2+(mx2-m+1)x1 |
x1x2 |
2mx1x2+(1-m)(x2+x1) |
x1x2 |
m2-5 |
1+m2 |
2m2 |
1+m2 |
m2-5 |
1+m2 |
A.2x-y-1=0 | B.x-2y+2=0 | C.2x-y+1=0 | D.x-2y-2=0 |
A.4 | B.4或-1 | C.
| D.-
|
A.
| B.
| C.2 | D.1 |
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