在
中,a,b分别是角A,B所对的边,
,
,
,则角A的大小为___________ ,AC边上的高为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019eb94a6a2b38308811470d860e1a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d710f4665a2b3c12d6bdf88a83833a1.png)
21-22高一下·北京·阶段练习 查看更多[2]
更新时间:2022-06-04 07:54:17
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【推荐1】在
中,已知
边上的中线
,且
,
,
成等差数列,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee73d637e8260733851b10b322b9cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7167cd55af72b5699802b277c33326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17497a284ddace3ee09fc81c2302628f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237bab1cfbf1bc851027fce1b2092d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】给出下列命题:
①函数
的一个对称中心为
;
②若
,
为第一象限角,且
,则
;
③在
中,内角
,
,
所对的边分别为
,
,
,若
,
,
,则
必有两解.
④函数
的图象向左平移
个单位长度,得到
的图象.
其中正确命题的序号是_________ (把你认为正确的序号都填上).
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaf2113a451ac34b2d2d3598a19946b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4af5de5941fdbf4cd6399b0eea050d9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f968380bd05be0a88c4c389b344050c.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0b43c15a4dead4153b925f136f56b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b4e59d995def7c0fc20d2e078bf088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef49e7474482594131ef9557a1a5861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
④函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325f9e2f7784ebdd64292e805884dfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8390974e4e4b17a53bf38806a8111560.png)
其中正确命题的序号是
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解题方法
【推荐1】为了给市民提供健身场所,某市因地制宜计划在-一个圆形的区域内修建一个如图所示的内接四边形健身步道
,其中A,B,C,D为休息点,AC,BD为便捷通道,现已知
,
,则
的最小值为___________ ;若
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87f3d9e79f0012fdb592df7dd2a8353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9f3646bf493d668cbccd5524dff81b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32450995497b9e341be832e9efad3114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a0abdf3eea0772418890031971fb56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e3555cd6c109962fecba3a677c5286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9e36c5987d6730e846753e0552c7d3.png)
![](https://img.xkw.com/dksih/QBM/2021/10/22/2834968765759488/2836347014742016/STEM/0da3e4e80afb4fc9b9c1455d13636881.png?resizew=171)
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【推荐2】在
中,
,
,
,
在线段
上,若
与
的面积之比为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
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