如图,在四边形ABCD中,
,
,
,则
=__________ ;(
+
)·
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caee19dd3672939bc47ff54626efea8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f82639f2f210b1695035ac5a3723e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3f87dc60e3c9072db5cc3c7f8ea9c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7a76738cb119310590601bb2c6d8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fdc83becc28e0f43d71427d9e8775d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/72ccec46-c198-4f44-af2b-dd4b5b235d48.png?resizew=150)
更新时间:2021-12-10 11:08:48
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【推荐1】平面四边形ABCD是边长为2的菱形,且
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