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已知向量=(,1),=(0,-1),=(k,).若与共线,则k= .
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/0.png)
=(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/1.png)
,1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/2.png)
=(0,-1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/3.png)
=(k,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/4.png)
).若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/5.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102538109027544/SYS201311031025381090275011_ST/6.png)
共线,则k=
.
考点分析:
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