在梯形
中,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0eb00223fca0a6e14114717b7c5e0b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-06-10 19:33:51
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相似题推荐
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适中
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【推荐1】在平面直角坐标系
中,
为单位圆与
轴正半轴的交点,角
的终边与单位圆相交于点
,将点
沿单位圆按逆时针方向旋转角
后到点
,
,
,以下命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf9304d22a3491440034660f115492a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6827cfe903f7acd5e0f5521ab27afcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bb993c2a4cf9f49e205845bc5054a3.png)
A.若![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() ![]() |
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【推荐2】下列四个选项中,化简正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】已知
的内角A,B,C所对边的长分别为a,b,c,O为
的外心,
,
的面积S满足
.若
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1490b1893c24654de1af84b1dc6f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f434335d35aabede3113c980b036be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f6aebbd26b65f4f1395a8f31129a6b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在
中,角
、
、
所对的边分别为
,
,
.则下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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【推荐1】已知以M为圆心的圆
与圆
相交于A,B两点,且
,给出以下结论,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24e3190c5e661f39f0066db429020c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19efd2f2662ca444c784b69e35f53120.png)
A.![]() | B.四边形![]() |
C.两圆心的距离![]() | D.![]() |
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【推荐2】在
中,角
、
、
所对的边分别为
、
、
,且
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/cb9ddb92f369de178435492044adb4e5.png)
A.![]() |
B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.![]() ![]() ![]() |
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【推荐3】在
中,
,点
在边
上,且
,
,则下列结论中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceda140bfed9920af9fdaa1a2e9b3be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34293b0e5b0ccd82aaf2197561865efc.png)
A.![]() |
B.当![]() ![]() |
C.当![]() ![]() ![]() |
D.存在点![]() ![]() |
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【推荐1】对于给定的
,其外心为O,重心为G,垂心为H,内心为Q,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470615552/STEM/71814d96-029b-43a0-a4df-4a58c1f07184.png?resizew=249)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/5/9/2717388672458752/2802889470615552/STEM/71814d96-029b-43a0-a4df-4a58c1f07184.png?resizew=249)
A.![]() | B.![]() |
C.![]() | D.若![]() ![]() ![]() |
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【推荐2】八卦是我国古代的一套有象征意义的符号.如图1是八卦模型图,其平面图形记为图2中的正八边形ABCDEFGH,其中
,则( )
![](https://img.xkw.com/dksih/QBM/2022/8/30/3055739366080512/3056809800368128/STEM/7fa717d9737a431c8dea0385cf8fac6f.png?resizew=328)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6634ccc2457dec1ce68b24c97fd23f47.png)
![](https://img.xkw.com/dksih/QBM/2022/8/30/3055739366080512/3056809800368128/STEM/7fa717d9737a431c8dea0385cf8fac6f.png?resizew=328)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐3】如图所示,设
,
是平面内相交成
角的两条数轴,
,
分别是与
轴,
轴正方向同向的单位向量,则称平面坐标系
为
反射坐标系.在
反射坐标系中,若
,则把有序数对
称为向量
的反射坐标,记为
.在
的反射坐标系中,
,
,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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