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时间:2021-04-24
《最新初三英语考前辅导ppt课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、初三英语考前辅导1、-----HowdoyoulearnEnglish?-----______listeningtotapes.A.ByB.WithC.ForD.In2、TrytosingmoreEnglishsongs,andyouwillfinditinteresting_____aforeignlanguage.A.LearningB.learnsC.learnD.tolearn3、I’dliketohavesomesoup,______deliciousitis!A.whatB.whataC.howD.howa4、Idon’tknow____hewillcometomorrow.___
2、_hecomes,Iwilltellyou.A.If;WhetherB.whether;WhetherC.If;ThatD.if;If11、----Youboughtthecarabouttenyearsago?-----Yes._____it’sold,itstillrunswell.A.SinceB.BecauseC.AlthoughD.But12、-----Whatdoyouthinkoftheproblem?-----It’s______difficultforus______workout.A.so;thatB.so;tooC.too;soD.too;to13、Idon’tthink
3、thesesixteen-year-oldchildrenshould________togotoanInternetcafé.A.allowB.beallowingC.allowedD.beallowed14、Myshoesareas_______asZhangHui’s.A.cheapB.cheaperC.thecheaperD.thecheapest15、Whilewewererunningontheground,Jacksuddenlystopped______andlayontheground.soweallstopped_______whatwaswrongwithhim.A.to
4、run;toseeB.running;seeingC.running;toseeD.tosee;running16、Iprefer______someshoppingto______fishingsincetheweatherisn’tfine.A.do;goingB.doing;goC.do;goD.doing;going17、-----Doyouknowthegirl_____ishelpingtheoldman?A.whomB.whoseC.whoD.Where18、Hehasafriendwho_____thepianoverywell.A.playB.playingC.playsD.
5、playedThankyouforlistening!Ihopeyoucanachieveexcellentresultsinthemidtermexamination三角函数公式及推导(祥尽解释)1-----诱导公式(之一):常用的诱导公式有以下几组:公式一:设α为任意角,终边相同的角的同一三角函数的值相等:sin(2kπ+α)=sinαcos(2kπ+α)=cosαtan(2kπ+α)=tanαcot(2kπ+α)=cotα公式二:设α为任意角,π+α的三角函数值与α的三角函数值之间的关系:sin(π+α)=-sinαcos(π+α)=-cosαtan(π+α)=tan
6、αcot(π+α)=cotα公式三:任意角α与-α的三角函数值之间的关系:sin(-α)=-sinαcos(-α)=cosαtan(-α)=-tanαcot(-α)=-cotα公式四:利用公式二和公式三可以得到π-α与α的三角函数值之间的关系:sin(π-α)=sinαcos(π-α)=-cosαtan(π-α)=-tanαcot(π-α)=-cotα1-----诱导公式(之二):公式五:利用公式一和公式三可以得到2π-α与α的三角函数值之间的关系:sin(2π-α)=-sinαcos(2π-α)=cosαtan(2π-α)=-tanαcot(2π-α)=-cot
7、α公式六之一:π/2±α及3π/2±α与α的三角函数值之间的关系:sin(π/2+α)=cosαcos(π/2+α)=-sinαtan(π/2+α)=-cotαcot(π/2+α)=-tanαsin(π/2-α)=cosαcos(π/2-α)=sinαtan(π/2-α)=cotαcot(π/2-α)=tanα公式六之二sin(3π/2+α)=-cosαcos(3π/2+α)
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