如图,已知菱形ABCD的边长为4,点E、F分别是AB、AD上的点,若BE=AF=1,∠BAD=120°,
=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700b9551004776e9d6d52e8fef1eef6f.png)
![](https://img.xkw.com/dksih/QBM/2020/12/22/2619431956570112/2620144949125120/STEM/ca821f5dd1d14e208370dbb2edc32f28.png?resizew=209)
更新时间:2021-01-03 20:52:46
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