已知a=(
,
),|b|=1,|a+2b|=2,则b在a方向上的投影=_______
![](https://img.xkw.com/dksih/QBM/2017/6/6/1702918882205696/1708067296968704/STEM/9f8d652411674800a4b6f0ae3e0fa4e3.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2017/6/6/1702918882205696/1708067296968704/STEM/d89be3b217e74d4aae7d011822cd342f.png?resizew=17)
更新时间:2017-06-13 15:34:43
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