a |
3 |
2 |
b |
1 |
3 |
a |
b |
A.15° | B.30° | C.45° | D.60° |
a |
3 |
2 |
b |
1 |
3 |
a |
b |
3 |
2 |
1 |
3 |
n |
A.(-1,-1) | B.(3,-3) | C.(-3,3) | D.(1,-2) |
a |
b |
c |
0 |
a |
b |
c |
a |
b |
A.至少有一根 | B.至多有一根 |
C.有两个不等的根 | D.有无数个互不相同的根 |
OA |
OB |
OM |
ON |
OA |
OB |
MN |
5 |
4 |
A.①、② | B.②、③ | C.①、③ | D.①、②、③ |
u |
v |
w |
A.
| ||||||||
B.
| ||||||||
C.
| ||||||||
D.对任一向量
|
OA |
OB |
AC |
OA |
BC |
AB |
A.(-3,-
| B.(3,
| C.(-3,
| D.(3,-
|
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