1 . 已知平面单位向量
,且
,记
,则y的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1454fcef553ffe0e341ac1d7af32a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0150d9c357f2f8f8deecacd3ef0545cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b54e29e2c4139d17f0e44282d84872.png)
您最近一年使用:0次
2 . 设P是
所在平面内一点,满足
,若
的面积为1,则
的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df088833dbde38ba54e5a01ba42d1de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
您最近一年使用:0次
3 .
中,A、B、C的对边分别为a、b、c,O是
的外心,点P满足
,若
,且
,则
的面积为_________ .
![](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/1cf331d9e282b74a251b5ba90fa53d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1dd07c0571772e96d318f974724810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e3d7ff3714e10fb99c3e034a28d257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
4 . 如图,在
中,
是边
上一点,且
.若点
满足
与
共线,
,则
的值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74effc94702a303938c6ffaea73c9e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c290cdc4cf3d6b82581e68ecaf5c7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07630df371b864a38c31c7a892afc17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25ea966ef10e746835367a4a505d1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f20d76b3bba25d63ead24238a0dec3f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/3fd973d4-61b2-452a-a462-8005d6b6e263.png?resizew=155)
您最近一年使用:0次
5 . 已知为△ABC的内心,且
.记R、r分别为△ABC的外接圆、内切圆半径,若
,则R=____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249b81fa939738d06d775a4c97294394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc5ff0f29dbb1816ec2a1e9aa55ee28.png)
您最近一年使用:0次
6 . 在△ABC中,
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14176f9e46bb305075f9138eb202326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0f9f3d4baed5c84de69e7c05ac859e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14176f9e46bb305075f9138eb202326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
您最近一年使用:0次
2020-05-11更新
|
1139次组卷
|
3卷引用:2019年全国高中数学联赛贵州省预赛
7 . 已知向量
满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a019c35a09b9fcb44a885e9e8be09b5.png)
,若
为
的夹角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d0692ba6c44c6087233b88c19bdba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a019c35a09b9fcb44a885e9e8be09b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbba9a992583ff1d781549a9065028e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ddc6cbc0819cacb4116db926b2e6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
您最近一年使用:0次
8 . 到一个三角形的三个顶点的距离的平方和最小的点,是这个三角形的( ).
A.垂心 | B.重心 | C.外心 | D.内心 |
您最近一年使用:0次
9 . 平面上的两个向量
、
满足
,
,且
,
.若向量
,且
.则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5038ca8098994dcc635e669b6a158d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aae1bc31a8462128c1906eed27dec66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0904a72b63d7c4fa77e7cbe9cb8448ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8825655b8b526fe207a94ca8434c82c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975a418253120c1e06e9c3f530c6b0c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/668ae2d0d4265fe68e7ce3a800a9d7c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8938257f9486c4b28768aa2cf4bb0f.png)
A.![]() | B.1 | C.2 | D.4 |
您最近一年使用:0次
10 . 如图,在直角三角形ABC中,
,
,点P是斜边AB上一点,且
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a500de3d45829f2c2a7f73932b9fc1f7.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6864a5a006350fe18591c1a1f1b96553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a500de3d45829f2c2a7f73932b9fc1f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/336ded55-f1fb-4830-98ab-c3cb76e3fd6e.png?resizew=128)
您最近一年使用:0次