1 . 在
中,
,
,
.若
,
(
),且
,则实数
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306675115da6dc073b46ac5c03c95732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535b26625378bb65a373d6fe9d16f67b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d125051e1acffc7ba99bfa6120478ad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b8e5990ef4ef314941a3154457a9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26157800469000581aebfd953269d0fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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12-13高三上·江苏盐城·阶段练习
2 . 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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3 . 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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2018高三上·江苏·专题练习
4 . 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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