4 |
9 |
BD |
DC |
AB |
AC |
y |
x-6 |
y |
x+6 |
y |
x-6 |
y |
x+6 |
4 |
9 |
x2 |
36 |
y2 |
16 |
DC |
sinβ |
AC |
sin∠D |
BD |
sin∠BAD |
AB |
sin∠D |
BD |
sin∠β |
AB |
sin∠D |
BD |
DC |
AB |
AC |
3 |
A.
| B.±
| C.
| D.±
|
π |
4 |
π |
3 |
A.
| B.2
| C.2
| D.2
|
3 |
2 |
A.45°或135° | B.135° | C.45° | D.30° |
A |
2 |
A |
2 |
A |
2 |
A |
2 |
5π |
12 |
6 |
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