x2 |
a2 |
1 |
2 |
3 |
a2-1 |
|-3-c+c| | ||
|
3 |
2 |
2 |
2 |
x2 |
3 |
1 |
2 |
1 |
2 |
|
9 |
4 |
1 |
2 |
1 |
2 |
3k |
1+3k2 |
9 |
4(1+3k2) |
(x2-x1)2+(y2-y1)2 |
(1+k2)[(x1+x2)2-4x1x2] |
3
| ||
1+3k2 |
1 |
2 |
3 | ||
2
|
1 |
2 |
9
| ||
4(1+3k2) |
1 |
1+3k2 |
1 |
3t |
1 |
3 |
9 |
4 |
|
9 |
4 |
|
9 |
4 |
-
|
1 |
1+3k2 |
1 |
2 |
A.
| B.2 | C.-1 | D.2或-1 |
|
2 |
7 |
4 |
x2 |
16 |
y2 |
9 |
A.
| B.
| C.
| D.
|
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