已知
为锐角
的两个内角,满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f466571e6ba408ad50c2cd84d86781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2023-07-16 03:44:41
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解题方法
【推荐2】若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9977831db28aca2fe85a5dd2662fa1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82ad5d04298a904c4af5ec058ff51ae.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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适中
(0.65)
【推荐1】在
中,角A,B,C所对的边分别是a,b,c,则“
”是
为直角三角形的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa7ef92d5c18fc34b340c164a5bbb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分又不必要条件 |
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【推荐2】
中,角A、B、C的对边分别为a、b、c,且
,
,则
面积的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504ad4ce789f120994c5f5d7bf1f41ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.4 | C.![]() | D.![]() |
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【推荐1】设
分别为双曲线
的左右焦点,
为双曲线的左顶点,以
为直径的圆交双曲线某条渐近线于
两点,且满足
,则该双曲线的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5dcd508629095d063e9aa13c65e946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a0dbff72922a6e4c6ccaf3378ddcfe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】甲烷
的分子结构中,相邻碳氢键的夹角都相等,设这个角为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff19349a80467d65564cc2953f0c978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e888ea14da893971e13858945bf0cd.png)
A.0 | B.![]() | C.![]() | D.![]() |
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【推荐1】在
中,
,
线段
上的一点,且
,则
取最小值时,
的模为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7fec46cfead8bd685928c7b62fcb657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5592af718b6b8969aaae765a531218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27e62ba44cbfec6823ebc1f0c7457fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42fecd8495150d3bed02f3981827939.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】一个矩形的周长为
,面积为
,则如下四组数对中,可作为数对
的序号是( )
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5727393791fc788d05098b4424bb455f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e06080f85d0ce44ef60224b84d2ad5.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ae286ae8a209bc659ace6354b79abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af61b97d9abdccf7b18afa17f79459d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2334c0880d206ebf5cec558c877433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5727393791fc788d05098b4424bb455f.png)
A.①③ | B.①③④ | C.②④ | D.②③④ |
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