题目内容
若向量
=(1,1),
=(1,-1),则
=
-
=.
| a |
| b |
| c |
| 1 |
| 2 |
| a |
| 3 |
| 2 |
| b |
| A.(1,2) | B.(2,-1) | C.(-1,2) | D.(0.5,-1.5) |
∵向量
=(1,1),
=(1,-1),
∴
=
-
=
(1,1)-
(1,-1)
=(
-
,
+
)
=(-1,2)
故选C
| a |
| b |
∴
| c |
| 1 |
| 2 |
| a |
| 3 |
| 2 |
| b |
=
| 1 |
| 2 |
| 3 |
| 2 |
=(
| 1 |
| 2 |
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
=(-1,2)
故选C
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| a |
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| c |
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