如图1,在平面直角坐标系中,点O为坐标原点,点A(3a,2a)在第一象限,过点A向x轴作垂线,垂足为点B,连接OA,S△AOB=12,点M从O出发,沿y轴的正半轴以每秒2个单位长度的速度运动,点N从点B出发以每秒3个单位长度的速度向x轴负方向运动,点M与点N同时出发,设点M的运动时间为t秒,连接AM,AN,MN.
(1)求a的值;
(2)当0<t<2时,
①请探究∠ANM,∠OMN,∠BAN之间的数量关系,并说明理由;
②试判断四边形AMON的面积是否变化?若不变化,请求出其值;若变化,请说明理由.
(3)当OM=ON时,请求出t的值.
(1)求a的值;
(2)当0<t<2时,
①请探究∠ANM,∠OMN,∠BAN之间的数量关系,并说明理由;
②试判断四边形AMON的面积是否变化?若不变化,请求出其值;若变化,请说明理由.
(3)当OM=ON时,请求出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/7d18920a-9ac0-46e0-8064-24561409afda.png?resizew=130)
更新时间:2019-07-15 11:53:51
|
【知识点】 根据平行线判定与性质证明
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】如图,
,求
的度数.请完善其解答过程,并在括号内填写相应的理论依据.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/8999dc09-3a49-4aab-b1fe-888bbab966a3.png?resizew=163)
解:∵
(已知),
∴___________
___________(______________________),
∴
(______________________),
∵
(___________),
∴
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7212037969556bb7f6bb5c8e81ee5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/8999dc09-3a49-4aab-b1fe-888bbab966a3.png?resizew=163)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a15b12702afc6606a7edabf5277dfd.png)
∴___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926e1a6fd573c2cce3aae4d0a83302c4.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c25cd74a9c5fb140d9ed10eb1d63272.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530691ab381ab7f63a9c28cf52abc80a.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】如图,已知
,
,
,请说明
的理由.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804605794385920/2805849569124352/STEM/32a862c6-62fa-44ef-b060-61d5e249e365.png?resizew=207)
解:因为
(已知)
所以
(_________)
因为
(已知)
所以
(___________)
因为
(已知)
所以
(__________)
即
__________.
所以
_________.(等量代换)
因此
(_____________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef699f5dc072b853cfe700c6f1abbbae.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804605794385920/2805849569124352/STEM/32a862c6-62fa-44ef-b060-61d5e249e365.png?resizew=207)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d803ba1fb531c0af4a5c3a7d16d7eb4.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40594a1429714bc69560e4555347a40c.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd9eb0048c82bed36d3e2ad96e81194.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4af17b55fa474f0103a858c2604b093.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
因此
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
您最近一年使用:0次