题目
题型:不详难度:来源:
(1)在整个运动过程中,当点F落在线段AM上和点G落在线段AC上时,分别求出对应t的值;
(2)在整个运动过程中,设正方形
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-90494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-44061.png)
(3)在整个运动过程中,是否存在点P,使
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-75606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-46499.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-71177.png)
解析
试题分析:(1)根据三角形的中位线易求t的值;
(2)分5种位置关系分别讨论;
(3)可以建立以点B为原点的直角坐标系,表示出这个三角形三个顶点的距离,再用两点间的距离公式表示出各边的长度,然后分两种情况讨论组成关于t的两个方程求解即可。
试题解析:(1)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023029-67953.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023029-89720.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023029-46175.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023029-71463.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023030-97895.png)
又∵当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023030-67299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023030-62519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-44061.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023030-13517.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023031-13890.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023031-68909.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023031-16408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023031-57096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023031-79569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023032-32276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023032-14924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023032-57216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023032-87904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023033-43800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023033-41305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023033-84168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023033-73291.jpg)
(3)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023033-47457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023034-36200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023034-43890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023034-71248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023034-11201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-34385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-15309.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-76808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-75606.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-70885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-71177.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-76487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-44761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-75606.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023036-60605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-75606.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023036-22663.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023036-16225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023036-58501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023037-79962.png)
综上,存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023035-44761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-71177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023028-75606.png)
核心考点
试题【已知:矩形ABCD中,M为BC边上一点, AB=BM=10,MC=14,如图1,正方形EFGH的顶点E和点B重合,点F、G、H分别在边AB、AM、BC上.如图2】;主要考察你对二次函数定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023020-59396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-77470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-32108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46661.png)
(1)求抛物线的表达式及对称轴;
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-62755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-58113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-55947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023021-46661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-98962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-55947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-58113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023022-19635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023023-99112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023015-99429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023016-47828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023009-56822.png)
(1)求y2的解析式;
(2)第几月销售这种水果,每千克所获得利润最大?最大利润是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023002-19948.png)
(1)如图1,若m=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023002-98798.png)
①当OC=2时,求抛物线C2的解析式;
②是否存在a,使得线段BC上有一点P,满足点B与点C到直线OP的距离之和最大且AP=BP?若存在,求出a的值;若不存在,请说明理由;
(2)如图2,当OB=2
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023003-25412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019023003-25412.png)
A.b≥-1 | B.b≤-1 | C.b≥1 | D.b≤1 |
最新试题
- 1下列句子中只有一个是正确的,请找出来这一项是[ ]A.通过这件事,我明白了一个道理。B.中国人民正在努力为建设一
- 2_______wonderful advice you have just _______me!A.How; toldB
- 3关于x的方程出现增根,则m=( ).
- 4完形填空。 This is a photo 1 Robert"s 2 . 3 Robert. He
- 5下列句子中没有语病的一项是( ) (3分)A.目前,市场上有转基因食品如大豆油、油菜籽油及调和油等均已作了标志,今
- 6读图某区域洋流图,分析回答13~14题。小题1:该洋流所在的海域位于( )A.北半球中低纬度B.北半球中高纬度C.南半球
- 7下列叙述不正确的是[ ]A.原电池是将化学能转化为电能的装置 B.铁船底镶嵌锌块,锌作负极,以防船体被腐蚀 C.
- 8在小说《西游记》中,下列哪个人物有历史原型:[ ]A.唐僧B.孙悟空C.猪八戒D.沙和尚
- 9某温度时,BaSO4在水中的沉淀溶解平衡:BaSO4(s) Ba2+(aq)+SO42-(aq) Ksp=c(Ba2+)
- 10【题文】已知函数是定义在上的奇函数,且满足,当时,,则使的的值是(
热门考点
- 1读我国重要的铁路枢纽示意图,铁路枢纽和铁路干线名称完全正确的是( )A.①是包兰线B.②是京九线C.③是铁路枢纽昆明D
- 2已知:101kPa时的辛烷的燃烧热为5518kJ•mol-1,强酸与强碱在稀溶液中发生反应时的中和热57.3kJ•mol
- 3—Did you pass the exam? —Yes, but I can"t pass it _____ the
- 4Mary could hardly stand up, ______walk. [ ]A. let alon
- 5离太阳最远的冥王星和海王星是非常寒冷的世界.冥王星的背阴面温度低至-253℃,向阳面也只有-223℃.冥王星背阴面的温度
- 6三位同学在铁路边议论,用哪种方法尽早听到远在视野外的火车开过来的声音( )A.在路基上,全神贯注,侧耳细听B.趴在路基
- 7下列各组物质的性质依次递减的是[ ]A.碱性:Al(OH)3、Mg(OH)2、NaOH B.还原性:HI、H
- 8设实数x,y满足x2-2x|y|+y2-6x-4|y|+27=0,则y的取值范围是______.
- 9若函数为偶函数,则a=( ).
- 10二战后的美苏争霸不同于一战前英德争霸的特点是①在世界范围内争夺霸权 ②核武器作为争霸的威慑力量 ③以军事集团为基础 ④反