x2 |
a2 |
y2 |
b2 |
| ||
5 |
x2 |
a2 |
y2 |
b2 |
c |
a |
| ||
5 |
c2 |
a2 |
1 |
5 |
a2-b2 |
a2 |
1 |
5 |
x2 |
20 |
y2 |
16 |
40 |
9 |
1+12 |
40
| ||
9 |
BF |
FQ |
| ||
20 |
| ||
16 |
| ||
20 |
| ||
16 |
(x1+x2)(x1-x2) |
20 |
(y1+y2)(y1-y2) |
16 |
y1-y2 |
x1-x2 |
4 |
5 |
x1+x2 |
y1+y2 |
4 |
5 |
6 |
-4 |
6 |
5 |
6 |
5 |
A.4π | B.8π | C.
| D.
|
3 |
A.
| B.
| C.
| D.
|
2 |
A.
| B.5
| C.5π | D.4π |
A.50π | B.25π | C.16π | D.9π |
A.8 | B.8π | C.4
| D.
|
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