资源描述:
《中考数学试题分类汇编无理数及二次根式》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、-一、选择题.(2009年绵阳市)已知是正整数,则实数n的最大值为()A.12B.11C.8D.3【答案】B.(2009年黄石市)下列根式中,不是最简二次根式的是()A.B.C.D.【答案】C.(2009年邵阳市)最接近的整数是( )A.0B.2C.4D.5【答案】B.(2009年广东省)4的算术平方根是( )A. B.2 C. D.【答案】B.(2009贺州)下列根式中不是最简二次根式的是( ).A.B.C.D.【答案】C.(2009年贵州黔东南州)下列运算正确的是(C)A、B、C、D、【答案】B.(2009年淄博市)计算的结果是(D)A.B.C.D..(2009年湖北省
2、荆门市)若,则x-y的值为()A.-1B.1C.2D.3解析:本题考查二次根式的意义,由题意可知,,∴x-y=2,故选C.【答案】C.(2009年湖北省荆门市)
3、-9
4、的平方根是()A.81B.±3C.3D.-3解析:本题考查绝对值与平方根的运算,
5、-9
6、=9,9的平方根是±3,故选B.【答案】B.(2009年内蒙古包头)函数中,自变量的取值范围是()A.B.C.D.【答案】B【解析】本题考查含二次根式的函数中中自变量的取值范围,由于二次根式中的范围是;∴中的范围由得。.(2009威海)实数a,b在数轴上的位置如图所示,则下列结论正确的是( )A.B.thedirectpunis
7、hment0.5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoisdirectlyresponsiblefortheaccide
8、ntresponsibility,givenoticeofcriticismand50-100economicsanctionsagainstthem.(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuitofleadership,alongwith500-1000punishment.(5)significantnearmissshould
9、beattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,serialnumbera1GB3323-2005steelfusionweldedbuttjoints,weldingengineering-Raylightingandqualityratingof2GB11345-89st
10、eelweldsmanualmethodsofultrasonicinspectionandtestingresultsforgrade3GB50236-2002industrialpipeweldingengineeringcodeforconstructionandacceptanceoffieldequipment4HGJ222-92technicalspecificationforweldingofaluminiumanditsalloys5lowtemperaturesteelweldingprocedure6SH3525-2004petrochemicalJB/T47
11、08-2000ofweldingprocedurequalificationforsteelpressurevessels7JB/4709-20008JB4730-2005pressurevesselweldingproceduresofsteelpressurevesselNDT9JB/T4744-2000steelpressurevesselproductsmechanicalpropertiestestofweldedplateII,mechanicalequipmenti