x2 |
a2 |
y2 |
b2 |
2 |
x2 |
a2 |
y2 |
b2 |
2 |
|
x2 |
8 |
y2 |
4 |
|
(x1+x2)(x1-x2) |
8 |
(y1+y2)(y1-y2) |
4 |
y1-y2 |
x1-x2 |
4 |
8 |
x1+x2 |
y1+y2 |
x |
2y |
x |
2y |
y |
x-1 |
x2 |
4 |
A.
| B.
| C.
| D.
|
x2 |
a2 |
y2 |
b2 |
3 |
x2 |
4 |
y2 |
m2 |
x2 |
m2 |
y2 |
2 |
A.1 | B.-1 | C.±1 | D.不确定 |
x2 |
9 |
y2 |
4 |
y2 |
m+2 |
x2 |
m-2 |
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