已知
的内角A,B,C的对边分别为a,b,c,设
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03575f173f0f112b7828790845fee204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a77a0ce91016ca634fa684b8146be3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-05-11 11:36:49
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【推荐1】下列命题中错误的是( )
A.“![]() ![]() |
B.“![]() ![]() ![]() |
C.对于命题p:![]() ![]() ![]() ![]() ![]() |
D.“![]() ![]() ![]() |
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【推荐2】若
,则“
”是“
,
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9f967d318ff7386bd2e100ef8e76d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9327d375b361b7d38c9c9125456a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99074f989e74d5ff306b4b7b7a379c1f.png)
A.充分非必要条件 | B.必要非充分条件 |
C.充要条件 | D.既非充分又非必要条件 |
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解题方法
【推荐1】已知
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c9c55592e113b5334c10296cab9aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24e7acc110bfc5121f02d98ee2e89fb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知
都是锐角,满足
,求
的值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b66bf41395fc97ade0b718448cc0eda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc4c63a548b91061528aa11058de75.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() |
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【推荐1】某公司要测量一水塔
的高度,如图所示,测量人员在
处测得该水塔顶端
的仰角为
,当他水平后退50米后,在
处测得该水塔顶端
的仰角为
,且
,
,
三点在同一直线上,则水塔
的高度约为( )(
)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/18a14746-e0a4-4b1c-bdc4-d84974a5f035.png?resizew=172)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe67394ed1a4ce45299d1f4c75108d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e84dcebc41098491b9ed7a0a9689d9a.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36baf54862dac47510132deac2277bb4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/18a14746-e0a4-4b1c-bdc4-d84974a5f035.png?resizew=172)
A.49.25米 | B.50.76米 |
C.56.74米 | D.58.60米 |
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解题方法
【推荐1】在
中,若
,则下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173314fdc27c25e9ac86d00c4fa0958b.png)
A.当![]() ![]() | B.当![]() ![]() |
C.当![]() ![]() | D.当![]() ![]() |
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【推荐2】在
中,角
的对边分别为
,
,
,
,设
边上的高为h,则h=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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