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如图,点C在以AB为直径的圆上,且满足CA=CB,圆内的弧线是以C为圆心,CA为半径的圆的一部分,在整个图形中随机取一点,则此点取自阴影部分的概率为( )
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高二下学期数学《》真题及答案
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如图圆O.的直径为5在圆O.上位于直径AB的异侧有定点C.和动点P.已知BC∶CA=4∶3点P.在半
如图圆O.的弦ABMN交于点C.且A.为弧MN的中点点D.在弧BM上.若∠ACN=3∠ADB求∠AD
如图A.B是圆O上的两点且AB的长度小于圆O的直径直线l与AB垂于点D且与圆O相切于点C.若AB=2
如图所示已知圆O.直径为AB是圆O.的直径C.为圆O.上一点且BC=过点B.的圆O.的切线交AC延长
如图CD为△ABC外接圆的切线AB的延长线交直线CD于点D.EF.分别为弦AB与弦AC上的点且BC·
如图已知圆O.的直径AB=4定直线L.到圆心的距离为4且直线L.垂直于直线AB.点P.是圆O.上异于
如图PQ=3以PQ为直径的圆与一个以5为半径的圆相切于点P.正方形ABCD的顶点A.B.在大圆上小
如图AB与⊙O.相切于点
,AC为⊙O.的直径,点D.在圆上,且满足∠BAD=40°,则 ∠ACD的大小是( ) A.50°
45°
40°
42°
如图AB为圆O.的直径C.为圆O.上的一点AD⊥平面ABCAE⊥BD于点E.AF⊥CD于点F.则BD
如图AB是圆O.的直径C.F.为圆O.上的点CA是∠BAF的角平分线.过点C.作CD⊥AF交AF的延
如图△ABC中以BC为直径的圆交AB于点D.∠ACD=∠ABC.1求证CA是圆的切线2若点E.是BC
如图圆O的直径AB的延长线与弦CD的延长线交于点PE是圆O上的一点弧AE与弧AC相等ED与AB交于点
如图EP交圆于E.C.两点PD切圆于D.G.为CE上一点且连接DG并延长交圆于点A.作弦AB垂直EP
4-1:几何证明选讲如图CD为△ABC外接圆的切线AB的延长线交直线CD于点D.E.F.分别为弦AB
下列说法正确的是
任意三点可以确定一个圆
平分弦的直径垂直于弦,并且平分该弦所对的弧
同一平面内,点P.到⊙O.上一点的最小距离为2,最大距离为8,则该圆的半径为5
同一平面内,点P.到圆心O.的距离为5,且圆的半径为10,则过点P.且长度为整数的弦共有5条
如图EP交圆于E.C.两点PD切圆于D.G.为CE上一点且PG=PD连接DG并延长交圆于点A.作弦A
如图AB为圆O.的直径点E.F.在圆O.上且BC⊥BE∠ABC=90°求证AF⊥平面CBF.第5题
矩形ABCD中AB=8点P.在边AB上且BP=3AP如果圆P.是以点P.为圆心PD为半径的圆那么下列
点
C.均在圆P.外; B. 点B.在圆P.外、点
在圆P.内; C.点B.在圆P.内、点C.在圆P.外;
点B.C.均在圆P.内.
如图AB是圆O.的直径点C.在圆O.上延长BC到D.使BC=CD过C.作圆O.的切线交AD于E.若A
如图圆O的直径为5在圆O上位于直径AB的异侧有定点C和动点P已知BCCA=43点P在半圆弧AB上运动
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30分TheotherdaymyhusbandandItookthekidsfordinneratabranchofPizzaExpress.Therewasaveryfriendlylady1aloneatthenexttable.Whenthetimecameforhertopaythe2herbankcardwasdeclined.Thewaitresstoldherinaverykindwaythattherewasa3butthatshewouldcallhermanagerforhelp.Seeingthismyhusband4gotupandtoldthewaitingstaffthatwewouldpayforthelady'smeal.5whenthemanagerarrivedheexplainedtotheladythatalthoughshecouldn'tuseher6therewasnoneedto7.PizzaExpressauthorizes授权therestaurantto8twofreemealspermonthandonthis9theywouldliketoprovideherwithafreemeal. Shewasextremelygratefulandapologeticthatshehadbeen10topay.Wewererelievedthattheladyhadbeen11withdignityinsteadofbeingplacedina12position. Thenthemanager13ourtable.Hesaidthat14wehadshownsuchgenerosityhewouldliketodonatethesecondfreemealthattherestaurantwasableto15tous!Wewereabsolutely16!Ihadneverheardofanychainrestaurantbehavinginsuchan17way.Wewerequite18withgratitude.ImadesurethattheladywasabletogethomeOKandthenwe19thestaffandleftourselves.Iwasreallyimpressedbyhowtherestauranthadtreatedthis20case. 1A.waiting B.dining C.ordering D.working 2A.menu B.recipe C.service D.bill 3A.problem B.solution C.disadvantage D.technique 4A.cautiously B.bravely C.immediately D.slowly 5A.However B.Finally C.Actually D.Therefore 6A.cash B.check C.phone D.card 7A.pay B.help C.worry D.bother 8A.giveaway B.pickup C.1etout D.takeon 9A.condition B.occasion C.moment D.demand 10A.ready B.1ikely C.unable D.unwilling 11A.appreciated B.encouraged C.treated D.pleased 12A.dangerous B.pleasant C.painful D.difficult 13A.approached B.removed C.noticed D.cleaned 14A.if B.after C.as D.when 15A.share B.offer C.spare C.cover 16A.annoyed B.astonished C.interested D.confused 17A.strange B.awkward C.abnormal D.generous 18A.filled B.equipped C.supplied D.burdened 19A.praised B.met C.greeted D.thanked 20A.unique B.regular C.special D.complex
将函数y=sinx﹣图象向左平移个单位所得函数图象的一条对称轴的方程是
已知二次函数y=x2-2kx+k2+k-2. 1当实数k为何值时图象经过原点 2当实数k在何范围取值时函数图象的顶点在第四象限内
如图所示二次函数y=k-2x2-4x+k-5的图像与x轴只有一个交点则交点的横坐标x0=.
如图四棱锥P﹣ABCD中底面ABCD为平行四边形∠DAB=60°AB=2ADPD⊥底面ABCD. Ⅰ证明PA⊥BD Ⅱ若PD=AD求二面角A﹣PB﹣C的余弦值.
已知等比数列{an}中a3=3则a1a5等于
已知函数fx=若ff1>4a2则实数a的取值范围是.
关于函数下列结论中不正确的是
某生产企业研发了一种新产品该新产品在某网店试销一个阶段后得到销售单价x和月销售量y之间的一组数据如表所示 Ⅰ根据统计数据求出y关于x的回归直线方程并预测月销售量不低于12万件时销售单价的最大值 Ⅱ生产企业与网店约定若该新产品的月销售量不低于10万件则生产企业奖励网店1万元若月销售量不低于8万件且不足10万件则生产企业奖励网店5000元若月销售量低于8万件则没有奖励.现用样本估计总体从上述5个销售单价中任选2个销售单价下个月分别在两个不同的网店进行销售求这两个网店下个月获得奖励的总额X的分布列及其数学期望. 参考公式对于一组数据x1y1x2y2…xnyn其回归直线=x+的斜率和截距的最小二估计分别为==. 参考数据=392=502.5
已知正项等比数列{an}满足a7=a6+2a5若存在两项aman使得则的最小值为
某生产企业研发了一种新产品该新产品在某网店试销一个阶段后得到销售单价x和月销售量y之间的一组数据如表所示 Ⅰ根据统计数据求出y关于x的回归直线方程并预测月销售量不低于12万件时销售单价的最大值 Ⅱ生产企业与网店约定若该新产品的月销售量不低于10万件则生产企业奖励网店1万元若月销售量不低于8万件且不足10万件则生产企业奖励网店5000元若月销售量低于8万件则没有奖励.现用样本估计总体从上述5个销售单价中任选2个销售单价下个月分别在两个不同的网店进行销售求这两个网店下个月获得奖励的总额X的分布列及其数学期望. 参考公式对于一组数据x1y1x2y2…xnyn其回归直线=x+的斜率和截距的最小二估计分别为==. 参考数据=392=502.5
如图所示的三视图表示的四棱锥的体积为则该四校锥的最长的棱的长度为
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设θ=R则“θ=是“sinθ=”的
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设θ=R则“θ=是“sinθ=”的
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已知函数fx=lnx﹣. Ⅰ求函数fx的单调区间 Ⅱ设gx=﹣x2+2bx﹣4若对任意x1∈02x2∈[12]不等式fx1≥gx2恒成立求实数b的取值范围.
已知i是虚数单位则复数=
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二项式x+8的展开式中的系数为.
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复数的共轭复数是
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曲线y=过点P2的切线方程为.
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