x2 |
a2 |
y2 |
b2 |
| ||
2 |
1 |
2 |
OM |
1 |
2 |
OA |
| ||
2 |
OB |
| ||
2 |
x2 |
4 |
2b2-1 |
2b2-1 |
OM |
1 |
2 |
OA |
| ||
2 |
OB |
x1 |
2 |
| ||
2 |
y1 |
2 |
| ||
2 |
x1 |
2 |
| ||
2 |
1+
| ||
2 |
3 |
| ||
2 |
| ||
2 |
| ||||
2 |
1+
| ||
2 |
xM |
2 |
3 |
| ||
2 |
x2 |
a2 |
y2 |
12 |
x2 |
20 |
y2 |
4 |
A.
| B.
| C.2 | D.
|
x2 |
9 |
y2 |
k2 |
x2 |
k |
y2 |
3 |
A.2 | B.k>3 | C.k=2或k=4 | D.0<k<2 |
x2 |
25 |
y2 |
9 |
x2 |
4 |
y2 |
2 |
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