AO |
AB |
AC |
A.(-∞,0) | B.(0,+∞) | C.(-1,0) | D.(0,1) |
AB |
OB |
OA |
AC |
OC |
OA |
AO |
AB |
AC |
AO |
OB |
OA |
OC |
OA |
OB |
OC |
OB |
OC |
OB |
x-1 |
x |
OC |
OB |
OC |
OB |
OC |
x-1 |
x |
1 |
x |
a |
AB |
1 |
2 |
a |
b |
b |
A.
| B.
| C.
| D.
|
A.a∥b且a、b方向相同 | B.a=b |
C.a=-b | D.以上都不对 |
a |
b |
a |
b |
A.(2,6) | B.(6,2) | C.(8,-2) | D.(-8,2) |
PA |
PB |
PC |
AC |
A.
| B.
| C.
| D.
|
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