1 . 已知不等式组
,在平面直角坐标系xOy中所表示的平面区域为D,D的面积为S,则下面结论:
①当
时,D为三角形; ②当
时,D为四边形;
③当
时,
; ④当
时,S为定值
.
其中正确的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cbc60120fa6a631621645cf6d3509dd.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a4eaa80b44625890339d6a0065c241.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9a5fbf690581d8517d264c254a1f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c343fddb5d98905bb22b9b08b15f3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dcb602001b786b3385f5380df65c9d3.png)
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586652130639872/2587373384417280/STEM/1b1398ab1f924cd68d02cd3f7e5038fb.png?resizew=27)
其中正确的序号是
您最近一年使用:0次
名校
2 . 已知直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a461995b90655f5133df6f61c2d09bd.png)
过点
,若可行域
的外接圆直径为20,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a461995b90655f5133df6f61c2d09bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574f2dd4e42bc75ae1f1ace14444a014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbd9feee35a21c5ce036341273fcf8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2511c0004fec1065b90b783dd795b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
您最近一年使用:0次
2010·山东烟台·一模
解题方法
3 . 已知不等式组
,表示的平面区域的面积为4,点P(x,y)在所给平面区域内,则
的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d171f05780cf9e163448e7d3df394557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4489516aca67a6afe53fac2f1477f76.png)
您最近一年使用:0次
4 . 已知
,集合
,
,如果
,则
的取值范围是______________ .
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097151598592/1572097156669440/STEM/b351ef455ddb484b86c5d3ad9c74e016.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097151598592/1572097156669440/STEM/e4b6e7993cb94510a130d29cc82f76ec.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097151598592/1572097156669440/STEM/8fee47d7787e4020b8e5b71d39567a6f.png?resizew=161)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097151598592/1572097156669440/STEM/0fcca10e44bd45a5a7a4970dd7cb4c60.png?resizew=68)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097151598592/1572097156669440/STEM/f3466911e5574f91879c82238d7601c0.png?resizew=9)
您最近一年使用:0次
5 . 已知
,集合
,
,如果
,则k的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ade5d5b877300624f159b0ef07dfb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce6c9179552c5115767dfaf219d6c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336517bdfb6d9cc969763edfb63bd966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c6551ee063ba33d1896f24275f921a.png)
您最近一年使用:0次
6 . 设不等式组
表示的平面区域为D,在区域D内随机取一点M,则点M落在圆
内的概率为___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7120a54724de478f3aeeaf2f8468ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
您最近一年使用:0次
2014·北京顺义·二模
7 . 已知点
在由不等式
确定的平面区域内,则点
所在的平面区域面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2757528522d20205bb3b057038cfe79b.png)
![](https://img.xkw.com/dksih/QBM/2014/5/12/1571711346737152/1571711351078912/STEM/7d29a35f251c48bdb49afa890e8c0552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7322db0c3d309a6da24d5efb3eb8403.png)
您最近一年使用:0次
2011·北京海淀·二模
名校
解题方法
8 . 点
在不等式组
表示的平面区域内,则
的最大值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9bab37386f1f7bc38682da0caa55cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75407f5349719aba26f58213459793eb.png)
您最近一年使用:0次
2012·宁夏银川·一模
9 . .已知不等式组
表示的平面区域
的面积为
,点
,则
的最大值为_________ .
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572243757826048/1572243763601408/STEM/3e9126b94767431eb220c063846bfe9a.png?resizew=56)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572243757826048/1572243763601408/STEM/6c1c7afb599e4797aa5d7530fc25ce8b.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572243757826048/1572243763601408/STEM/51d8c3e31c6a4c1194940e8bbd044f85.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572243757826048/1572243763601408/STEM/34c20424a9e64f24931c8bbf9ac0cb39.png?resizew=76)
![](https://img.xkw.com/dksih/QBM/2015/9/25/1572243757826048/1572243763601408/STEM/ed342bfbbef7452981ed81a70648f1f7.png?resizew=71)
您最近一年使用:0次