x2 |
5 |
x2 |
3 |
A.等于零 | B.大于零 |
C.小于零 | D.以上三种情况都有可能 |
|
|
| ||
2 |
1 |
2 |
PF1 |
| ||
2 |
1 |
2 |
PF2 |
| ||
2 |
1 |
2 |
PF1 |
PF2 |
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
x2 |
a2 |
y2 |
b2 |
F2 |
F2B1 |
F2B2 |
A.
| B.
| C.
| D.
|
x2 |
4 |
y2 |
3 |
PF1 |
PF2 |
A.[
| B.[1,2] | C.[2,3] | D.[0,1] |
x2 |
a2 |
y2 |
b2 |
A.
| B.
| C.
| D.
|
x2 |
25 |
y2 |
16 |
x2 |
a2 |
y2 |
b2 |
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