a |
x |
2 |
y | ||
|
b |
x |
2 |
y | ||
|
a |
b |
A.1 | B.2 | C.5 | D.1或5 |
a |
x |
2 |
y | ||
|
b |
x |
2 |
y | ||
|
a |
b |
x |
2 |
x |
2 |
y | ||
|
y | ||
|
x2 |
4 |
y2 |
5 |
5 |
a2+b2 |
1 |
2 |
PA |
PB |
5 |
a |
3 |
b |
a |
b |
3 |
b |
A.(
| B.(
| C.(
| D.(1,0) |
a|= |
b|= |
a |
b |
a |
b |
a |
b |
i |
j |
k |
i |
j |
k |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
A.
| B.7或
| C.7 | D.7或
|
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