x2 |
4 |
OP |
OA |
OB |
A.a2+b2≥2 | B.a2+b2≥
| C.a2+b2≤2 | D.a2+b2≤
|
OP |
OA |
OB |
(2a+2b)2 |
4 |
1 |
4 |
1 |
2 |
u |
v |
v |
u |
a |
b |
a |
b |
c |
c |
a |
b |
a |
b |
a |
b |
OA |
OB |
OC |
a |
b |
a |
b |
a |
b |
A.(-2,-4) | B.(-3,-6) | C.(-4,-8) | D.(-5,-10) |
AC |
AB |
DA |
BA |
CD |
a |
b |
c |
a |
b |
d |
a |
b |
c |
d |
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