x2 |
16 |
y2 |
4 |
x12 |
16 |
y12 |
4 |
x22 |
16 |
y22 |
4 |
(x1-x2)(x1+x2) |
16 |
(y1-y2)(y1+y2) |
4 |
y1-y2 |
x1-x2 |
4(x1+x2) |
16(y1+y2) |
4×2 |
16×2 |
1 |
4 |
1 |
4 |
x2 |
a2 |
y2 |
b2 |
A.∠PFR>∠QFR |
B.∠PFR=∠QFR |
C.∠PFR<∠QFR |
D.∠PFR与∠AFR的大小不确定 |
A.±arctan
| B.
| ||||||||||||
C.arctan
| D.arctan
|
π |
2 |
1 |
4 |
AB |
A.
| B.
| C.
| D.
|
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