如图,在等边
中,
,点
在边
上,已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2e0cab3b6c2ab617079e40ac5e7a1b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6964f0823a8f98f828d9fe339e76bb49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2e0cab3b6c2ab617079e40ac5e7a1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/a2a6885f-ff33-4daf-ad79-6931531ec452.png?resizew=133)
2023高三·全国·专题练习 查看更多[1]
(已下线)第45练 计算基础综合训练5
更新时间:2023-04-05 22:38:01
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解题方法
【推荐1】已知等边
的边长为2,若点D满足
,则
=__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8488ec91652ad560475f6d45c8e20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411415e216eeb520a1d8181999111686.png)
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解题方法
【推荐2】由共斜边的两块直角三角板拼成一个平面四边形
,其中
为以
为直角的等腰直角三角形,
为以
为直角的直角三角形,且
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d829e1e4e92479ee7ee91316a1020df8.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐1】给定两个长度为
的平面向量
和
,它们的夹角为
.如图所示,点
在以
为圆心的圆弧
上变动,若
其中
,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f605ec0729ce6d72237ad662a06862.png)
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【推荐2】如图,在直角梯形
中,
∥
,
,
,
,
是
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696e426da7add47f580de1deb4cc6f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7081ac76e5ac1e22e848eec143578f1c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://img.xkw.com/dksih/QBM/2017/4/5/1659375076982784/1659905688903680/STEM/70e6da53900440039ce87634138e763c.png?resizew=146)
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