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已知椭圆，A，B是椭圆上的两个点，线段AB的垂直平分线与x轴相交于点P(x0，0)，证明。
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证明定理三角形三条边的垂直平分线相交于一点并且这一点到三个顶点的距离相等.已知如图在△ABC中分别作
如图点P.Q.分别在∠AOB的两边OAOB上若点N.到∠AOB的两边距离相等且PN＝NQ则点N.一定
∠AOB的平分线与PQ的交点
∠OPQ与∠OQP的角平分线的交点，
∠AOB的平分线与线段PQ的垂直平分线的交点
线段PQ的垂直平分线与∠OPQ的平分线的交点
用尺规作图已知底边和底边上的高求作等腰三角形有下列作法①作线段BC＝a②作线段BC的垂直平分线m交B
线段垂直平分线上的点到线段两个端点的距离相等
角平分线上的点到这个角两边的距离相等
等角对等边
等腰三角形的对称性
已知MN是线段AB的垂直平分线下列说法正确的是
与AB距离相等的点在MN上
与点A.和点B.距离相等的点在MN上
与MN距离相等的点在AB上
AB垂直平分MN
命题到线段两端距离相等的点在这条线段的垂直平分线上的结论是
在这条线段的垂直平分线上
这点在这条线段的垂直平分线上
线段的垂直平分线上有个点
这点在垂直平分线上
下列说法中错误的是
过“到线段两端点距离相等的点”的直线是线段的垂直平分线
线段垂直平分线的点到线段两端点的距离相等
线段有且只有一条垂直平分线
线段的垂直平分线是一条直线
已知直线与双曲线一支交于两点为双曲线的两个焦点则在
以
，
为焦点的椭圆上或线段
的垂直平分线上
以
，
为焦点的双曲线上或线段
的垂直平分线上
以
为直径的圆上或线段
的垂直平分线上
以上说法均不正确
已知椭圆C.过点是椭圆的左焦点P.Q.是椭圆C.上的两个动点且|PF||MF||QF|成等差数列1求
已知椭圆C.过点点F.－0是椭圆的左焦点点P.Q.是椭圆C.上的两个动点且|PF||MF||QF|成
下列说法①若直线PE是线段AB的垂直平分线则EA=EBPA=PB②若PA=PBEA=EB则直线PE垂
其中正确的个数有（ ）
A．1个 B．2个
3个
4个
已知椭圆的四个顶点恰好是一边长为2一内角为60°的菱形的四个顶点.Ⅰ求椭圆M的方程Ⅱ直线l与椭圆M交
已知椭圆是椭圆上纵坐标不为零的两点若其中F.为椭圆的左焦点.Ⅰ求椭圆的方程Ⅱ求线段AB的垂直平分线在
椭圆的右焦点为F.其右准线与x轴的交点为A.在椭圆上存在点P.满足线段AP的垂直平分线过点F.则椭圆
阅读下面材料在数学课上老师提出如下问题尺规作图作一条线段的垂直平分线.已知线段AB.求作线段AB的垂
椭圆＝1a>b>0的右焦点F.其右准线与x轴的交点为A.在椭圆上存在点P.满足线段AP的垂直平分线过
若椭圆+=1a>b>0的右焦点为F.其右准线与x轴的交点为A.在椭圆上存在点P.使得线段AP的垂直平
下列说法①若直线PE是线段AB的垂直平分线则EA=EBPA=PB②若PA=PBEA=EB则PE是线段
其中正确的个数为（ ）
A．1个 B．2个
3个
4个
下列说法①若直线PE是线段AB的垂直平分线则EA=EBPA=PB②若PA=PBEA=EB则直线PE垂
1个
2个
3个
4个
已知真命题若A.为⊙O.内一定点B.为⊙O.上一动点线段AB的垂直平分线交直线OB于点P.则点P.的
已知椭圆C.F1F2分别是其左右焦点以F1F2为直径的圆与椭圆C.有且仅有两个交点.1求椭圆C.的方
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DoanimalshaveacultureWhatdowemeanby"culture"Latelysocialscientistshavebeguntoaskifcultureisfoundjustinhumansorifsomeanimalshaveaculturetoo.Whenwespeakofculturewemeanawayoflifeagroupofpeoplehaveincommon.Cultureincludesthebeliefsandattitudeswelearn.Itisthepatternsofbehaviorthathelppeopletolivetogether.Itisalsothepatternsofbehaviorthatmakeonegroupofpeopledifferentfromanother. Ourcultureletsusmakeupforhavinglostoutstrengthclawslongteethandotherdefenses.Insteadweusetoolscooperatewithoneanotherandcommunicatewithlanguage.Buttheseaspectsofhumanbehavioror"culture"canalsobefoundinthelivesofcertainanimals.Animalscanmaketoolsforexample.Weusedtothinkthattheabilitytousetoolswasthedividinglinebetweenhumanbeingsandotheranimals.Latelyhoweverwehavefoundthatthisisnotthecase.Chimpanzees黑猩猩cannotonlyusetoolsbutactuallymaketoolsthemselves.Animalscanalsoshareknowledgewitheachotherandusetheirownlanguagetocommunicate.Soitmaybeimportantforustoknowthatthelinedividingusfromanimalsisnotasclearasweusedtothink. ThefirstsentenceofthesecondparagraphOurcultureletsusmakeupforhavinglostourstrengthclawslongteethandotherdefensesmeans.
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，
为焦点的椭圆上或线段
的垂直平分线上 以，为焦点的双曲线上或线段的垂直平分线上 以为直径的圆上或线段的垂直平分线上 以上说法均不正确
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