解题方法
1 . 已知在
中,
,
,
,点D满足
,点E满足
,其中
.
(1)求
的值;
(2)用向量方法判断是否存在
使
,若存在,求
的值;若不存在,说明理由;
(3)令AE与CD相交于点O,若
,请用
表示实数t.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c278812c4813f6391c7993574e2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59ab6bf6111dda4a3d428454768b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0d53573554894dbe3b31027d7cdfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a779c29506937cf02995e1f2e8935f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e41211eef74318dbf464acf1a716fdd.png)
(2)用向量方法判断是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)令AE与CD相交于点O,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ecc633ba1ec1a478a170cb7864820be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2 . 以下说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/079483d1-2d86-491e-b32c-47585ca23d22.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/079483d1-2d86-491e-b32c-47585ca23d22.png?resizew=194)
A.对![]() ![]() ![]() |
B.设![]() ![]() |
C.若![]() ![]() ![]() |
D.正方体![]() ![]() ![]() |
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