题目内容
已知非零向量
="(x1" ,y1),
="(x2" ,y2),下列条件中能推出
⊥
的有
①
·
=0; ②x1 x2+y1y2=0; ③∣
+
∣=∣
-
∣;
④
2+
2=(
-
)2; ⑤x1 y2—x2y1="0;"
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
①
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
④
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
A.2个 | B.3个 | C.4个 | D.5个 |
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200982256.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214201497168.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214201497168.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/201408232142017931184.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200405300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214200436312.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823214202417929.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.2个 | B.3个 | C.4个 | D.5个 |