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如图是小琳探究平面镜成像特点的实验装置． （1）其中“甲”图是玻璃板，而“乙”图是平面镜，你认为小琳应该选择 图进行实验更合理，该实验在环境较 （选填“亮”或“暗”）进行效果更好． （2...
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1分﹣AspeechonIndiancultureinourschoolhallyesterdayafternoon. ﹣Whatapity!Imissedit. A.gives B.gave C.wasgiven D.willbegiven
如果两个相似三角形的面积比为49较小三角形的周长为4那么这两个三角形的周长和为．
已知梯形ABCD中AD∥BCAB⊥BCAD＝3AB＝6DF⊥DC分别交射线AB射线CB于点EF． 1当点E为边AB的中点时如图1求BC的长 2当点E在边AB上时如图2联结CE试问∠DCE的大小是否确定若确定请求出∠DCE的正切值若不确定则设AE＝x∠DCE的正切值为y请求出y关于x的函数解析式并写出定义域 3当△AEF的面积为3时求△DCE的面积．
已知如图1二次函数y＝ax2+2ax﹣3aa≠0图象的顶点为C与x轴交于AB两点点A在点B左侧点CB关于过点A的直线ly＝kx+对称． 1求AB两点坐标及直线l的解析式 2求二次函数解析式 3如图2过点B作直线BD∥AC交直线l于D点MN分别为直线AC和直线l上的两个动点连接CNMMMD求CN+NM+MD的最小值．
10分HistoryofAfternoonTea Afternoonteabecamepopularduringtheearlynineteenthcentury.Aroundthistimethe7thDuchess公爵夫人ofBedfordAnnawassaidtobeangryabouthavingthatsinkingfeelingduringthelate16.Atthattimeitwasusualforpeopletotakeonly17mainmealsadaybreakfastanddinnerataround8o'clockintheevening.ThesolutionfortheDuchesswasapotofteaandsomelight18 takentoherroomduringtheafternoon. LaterfriendswouldjoinherinherroomsandthissummerpracticeprovedsopopularthattheDuchess19itwhenshereturnedtoLondon.ShesentcardstoherfriendsandaskedthemtojoinherforteaandawalkinHydePark.Othersocialhostessesquickly20theideaandthepracticebecamerespectableenoughtomoveintothedrawingroom.Afterthatalloffashionablesocietybegandrinkingteaandeatingsandwiches21inthemiddleoftheafternoon. Sometimesyouwillseehotels22ahightea.Traditionallytherichpeoplewouldhaveanafternoonteaaroundfouro'clockjustbeforethe23inHydeParkwhilethe24peoplewouldhavetealaterinthedayatfiveorsixo'clock.Itiscalledhightea.Thenamecomesfromthe25ofthetablesonwhichthemealsareserved.Highteaisservedatthedinnertablewhichisusuallyveryhigh. 16.A.morning B.noon C.afternoon D.evening 17.A.two B.three C.four D.five 18.A.snacks B.cards C.flowers D.souvenirs 19.A.started B.continued C.finished D.stopped 20.A.gaveup B.cheeredup C.thoughtof D.heardof 21.A.angrily B.happily C.noisily D.sadly 22.A.buying B.using C.serving D.feeding 23.A.walk B.run C.chat D.meet 24.A.wealthy B.poor C.lucky D.unlucky 25.A.space B.weight C.length D.height
如图已知▱ABCD的对角线交于点O点E为边AD的中点CE交BD于点G． 1求的值 2如果设试用表示．
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1分﹣Lilywhydoyoulikeclassicalmusicsomuch?﹣Becauseitcanalwayshelpme放松whenIfeelstressed.
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如果那么＝．
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