A.(x,-y) | B.(-x,-y) | C.(-y,-x) | D.(-x,y) |
b |
a |
x2+y2 |
(λx)2+(λy)2 |
b |
AC |
1 |
2 |
CB |
CE |
1 |
4 |
ED |
A.(-8,-
| B.(-
| C.(0,1) | D.(0,1)或(2,
|
OA |
OB |
OC |
AB |
A.(6,0) | B.(-6,0) | C.(-2,6) | D.(-2,0) |
. |
a |
b |
a |
. |
b |
. |
a |
b |
a |
1 |
2 |
| ||
2 |
b |
c |
a |
b |
c |
0 |
a |
b |
c |
a |
b |
b |
c |
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