12-13高三上·江苏盐城·阶段练习
1 . 在△OAB中,已知P为线段AB上的一点,若
,
,
,且
与
的夹角为60°,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa534f31f5d56d3f0b4cc3a29c1d630.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811e40a3bb22a4ac38e4ff8c78077cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612ced101f95eb7c9ea960cbff045dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eeb629a6f94d187154b9e0fba4eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987a2625dae99578e5c0e7b57d4a1c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ba7499bd7ef12d4be6a78d868d4800.png)
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2 . 在
中,
,
,D为AB边上的中点,则
等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68d5fab76be5d73f357190f9d37f94a.png)
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2020·江苏·二模
解题方法
3 . 在
中,
,
,且
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c528a7334eda7f7d6133f1d6fb1496.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4f452b23fe85c854f75029d7de1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c528a7334eda7f7d6133f1d6fb1496.png)
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4 . 在
中,点
满足
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113986d9507fc5015e71989831c128b.png)
___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ddf608e1e270dce331152d777bac29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e087f4d00807644ff4487eeb68828d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bada57981d325754b512c0ea0ae72a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113986d9507fc5015e71989831c128b.png)
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2011·江苏南京·一模
5 . 如图,四边形
中,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6dc1f17feef5640420c75406ab3c04.png)
____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6dc1f17feef5640420c75406ab3c04.png)
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223672418304/1570223677546496/STEM/956994f6dbe440e0b3705b6e1e0b9d60.png?resizew=208)
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2018高三上·江苏·专题练习
6 . 扇形
中,弦
为劣弧
上的动点,
与
交于点
,则
的最小值是_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27dad391e8c1a0c80f8e7e44a72e5307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe35c91649a5bea2518387a2b36e0c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f436fa774c554e6ea2ffcbc41c7417b.png)
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2018高三·江苏·专题练习
7 . 如图,在
中,
,
,
是边
上的高,当
时,
的最大值与最小值之和为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dcbd171693a47c5b932a5e84de10c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8bbb3089f861841757a5452505b8e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291b91eba7f6d304df257227d6626748.png)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925357664591872/1929123877158912/STEM/d69350419ce84bae9f7c5c81872716a3.png?resizew=254)
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