名校
1 . 相传,太极八卦图是古代圣人伏羲氏首创,如图2是八卦模型图,其平面图形记为图3中的正八边形
,则给出下列结论:
①
;
②
;
③
.
其中正确的结论为( )
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064376393728/STEM/c01e486c-1f50-46c3-94bb-7562bdafcbbb.png?resizew=347)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d4a6cf11cda87b3dfafaecdec683f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeca02d122593229b121931d1a2d7154.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d73894a10cc9e8f50c3cb885d3fbcc6.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653bbd65d3a4d53b81f0271ba09793d2.png)
其中正确的结论为( )
![](https://img.xkw.com/dksih/QBM/2022/4/23/2964227907231744/2965064376393728/STEM/c01e486c-1f50-46c3-94bb-7562bdafcbbb.png?resizew=347)
A.①② | B.②③ | C.② | D.③ |
您最近一年使用:0次
2022-04-24更新
|
391次组卷
|
2卷引用:陕西省西安建筑科技大学附属中学2021-2022学年高一下学期第二次月考数学试题
名校
解题方法
2 . 在
中,D为
的中点,E为
上一点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dffb1e184fc253f283924cabaf3b2ceb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-04-14更新
|
586次组卷
|
4卷引用:陕西省渭南市大荔县2021-2022学年高一下学期期末数学试题
名校
解题方法
3 . 在
中,
,
分别在线段
,
上,且
,
,点
是线段
的中点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898c53132812955f9d9ac286e5153971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dcf2f445f03af259458d5f4478f7ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12e2b30f8d0df7b44780dbf2f43023b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2021-08-02更新
|
369次组卷
|
8卷引用:陕西省安康市2021-2022学年高三上学期期末理科数学试题
名校
4 . 设
,
是两个不共线的向量,
,
,
.
(1)若平面内不共线的四点O,A,B,C满足
,求实数k的值;
(2)若A,C,D三点共线,求实数k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02bdbb1d101da9412e0b248e6989097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04ac4f51b38ae6757af9f8d3c0a87a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb78c7cd736ff2ef0fba8380127980af.png)
(1)若平面内不共线的四点O,A,B,C满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c6ae0c7a1429d4dacf069042a63fcd.png)
(2)若A,C,D三点共线,求实数k的值.
您最近一年使用:0次
2020-02-26更新
|
496次组卷
|
3卷引用:陕西省榆林市第十中学2021-2022学年高一下学期期中数学试题
名校
5 . 已知
外接圆半径为1,圆心为
,若
,则
面积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b5b59beabd101e3df40df813bf41b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
A.2 | B.![]() | C.![]() | D.1 |
您最近一年使用:0次
2020-02-18更新
|
1023次组卷
|
8卷引用:陕西省铜川市宜君县高级中学2021-2022学年高二下学期期末文科数学试题
6 . 如图,在平行四边形
中,对角线
交
于点
,则
等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/6ce5b7f7-d8bf-4111-a6bd-34f3f28f798c.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c0537bdc684552c4609b7280b1d98a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/6ce5b7f7-d8bf-4111-a6bd-34f3f28f798c.png?resizew=154)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-01-19更新
|
624次组卷
|
2卷引用:陕西省渭南市富平县2021-2022学年高一下学期期末数学试题