2 |
p |
2 |
p |
2 |
|
1 |
2 |
1 |
2 |
1 |
2 |
( x1+x2) 2-4x1x2 |
2 |
2 |
2 |
A.y+2=
| B.y-2=
| ||||||||
C.
| D.
|
A.y=-2x+4 | B.y=
| C.y=-2x-
| D.y=
|
A.x+y-3=0 | B.3x+y-6=0 | C.3x-y+6=0 | D.x-3y-2=0 |
A.3x-y+5=0,x+2y-7=0 | B.2x+y-4=0,x-2y-7=0 |
C.2x-y+4=0,2x+y-7=0 | D.3x-2y-2=0,2x-y+2=0 |
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