初中数学二次根式专项练习 4页

__________________________________________________二次根式题型专练1、下列各式中①；②；③；④；⑤；⑥一定是二次根式的有_______个.2、使式子有意义的的取值范围是（）A.B.C.D.3、已知，，则________．4、在式子中，字母的取值范围是________．5、若、为实数，且，则的值为____．6、如果实数，，在数轴上的位置如图所示，那么代数式可以化简为（　　）A．B．C．D．7、把根号外的因式移入根号内，其结果是（　　）A．B．C．D．8、把代数式的根号外的因式移到根号内的结果为________．9、已知实数满足，则的值是（　　）A．B．2005C．2006D．200710、已知实数满足，则=________．11、下列二次根式中，最简二次根式的个数是（　　），，，，，，，．A．1个B．2个C．3个D．4个12、计算收集于网络，如有侵权请联系管理员删除\n__________________________________________________13、计算：_______14、计算：________15、计算16、17、计算________18、化简求值：已知，，求⑴；⑵19、若，则20、观察式子：，，，，…，则第10个式子是________．21、比较大小：________．22、已知，，，那么的大小关系是（　　）A．B．C．D．收集于网络，如有侵权请联系管理员删除\n__________________________________________________答案：1、32、B3、34、5、6、C7、B8、9、C10、811、B12、213、14、115、原式16、原式17、118、，∴，19、或20、21、>22、CA:Hello,sir!B:Hello!A:Nicetomeetyou!B:Nicetomeetyou!So,youinterestthepositionasanAssistantManager.A:Yes,that’sright.B:Ok,Canyoutellmealittlebitaboutyourself?A:Ofcourse,sir,mynameisPeterXie,Iam25yearsold,andIgraduatedfromGuangdongUniversityofForeignStudiesthreeyearsago.MymajorwasEnglish,andiminoredinfinance,besides,Iamalsoatrainedinterpreter.Icanshowyoumycertificatesifit’snecessary.B:MayIaskwhyyouareinterestedinworkingforourcompany?A:Lastweek,IreadyourjobadvertisementinChinaDaily.Ilearnedyouhadanopeningformarketingmanager.SoIappliedforthisposition.Yourcompanyisone收集于网络，如有侵权请联系管理员删除\n__________________________________________________oftheworld’slargestmanufacturersofelectronicproducts.Inthepasttenyears,ithashadanimpressivegrowthrecord.Twoyearsago,youenteredChina’smarket.Atpresent,yourproductsareenjoyingabiggermarketshareinChina.IfIhavetheopportunitytoworkforthiscompany,IbelieveI’llbeabletodevelopmyabilities,andmakesomecontributionstothecompany.B:Our company gives every person the opportunity to show their talents. And we treasure persons with ability.Ok! I found there’s there many  reward on your resume. Er , Computer programming certificate of grade 2 3 &4, Spoken English ,and CET6. When did you get them .Did those influenced you course study on the class? A:Enhen ,I got those certifications in the spare my time. I’m hardworking all the time . I also earned a good score in class and ranked at top. B:Ok,canyoutellmesomethingaboutyourhobbies,yourcharactersA:Yeah,Ilikedancingandswimming,butnotverygoodatthem.Asformycharacters,IthinkIamanoutgoing,responsible,andcarefulperson.B:Well,Doyouhaveanyrelevantworkexperiences?A:Yes,Ihave,aftergraduated;Iworkedforatelecomcompanyforthreeyears.B:MayIaskwhyyouquit?A:Ithinkthereweretworeasons.First,Ididn’tlikethemanagementthere.Everyoneinthecompanyseemedtoeatoutofthesamebigpot.Ourpaywasnotlinkedtoourworkperformanceandcontributions.Second,therewasnochanceofpromotion.Itseemedtomethatpeoplewerepromotedbyfavoritismratherthanbasedontheirmerit.B:Well,thelastquestion.IamreallysatisfiedwithyourallyouranswersandIthinkyourperformanceisnearlyimpeccable,butobviously,nobodycanbeperfect,andwehavekindsofweaknesses,Whatdoyouconsideryourgreateststrength?A:Letmesee…Iwouldsaythatmygreatestweaknessisbeingtoomuchofperfectionistinmywork.Sometimes,Ispendmoretimethannecessaryonatask,althoughInevermissedthedeadline,itisstillaneffortformetoknowwhentomoveontothenexttask,andtobeconfidentwhenassigningotherswork.B:Ok,thanksforyourcooperation,ifwemadeadecision,wewillinformyouimmediately.收集于网络，如有侵权请联系管理员删除