已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/0.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/1.png)
的夹角为120°,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/3.png)
.若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/4.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279014_ST/5.png)
,则实数λ=
.
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745727901/SYS201310251243157457279010_ST/0.png)
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