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leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively广东省深圳市宝安区2015届中考数学模拟试题一、选择题（本部分共12小题，每小题3分，共36分．）1．4的平方根是（）A．2B．﹣2C．±2D．162．2011年8月12日，第26届世界大学生夏季运动会将在深圳开幕．本届大运会的开幕式举办场地和主要分会场深圳湾体育中心总建筑面积达256520m2．数据256520m2用科学记数法（保留三个有效数字）表示为（）A．2.565×105m2B．0.257×106m2C．2.57×105m2D．25.7×104m23．下列各图是一些常用图形的标志，其中是轴对称图形但不是中心对称图形的是（）A．B．C．D．4．下列运算正确的是（）A．3ab﹣2ab=1B．x4•x2=x6C．（x2）3=x5D．3x2÷x=2x5．下列说法正确的是（）A．一个游戏的中奖概率是，则做5次这样的游戏一定会中奖B．为了解深圳中学生的心理健康情况，应该采用普查的方式C．事件“小明今年中考数学考95分”是可能事件D．若甲组数据的方差S=0.01，乙组数据的方差S=0.1，则乙组数据更稳定6．如图，已知BD是⊙O的直径，点A、C在⊙O上，=，∠AOB=60°，则∠BDC的度数是（）A．20°B．25°C．30°D．40°7．不等式组的解集在数轴上表示正确的是（）A．B．leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively2C．D．8．一家商店将某种商品按进货价提高100%后，又以6折优惠售出，售价为60元，则这种商品的进货价是（）A．120元B．100元C．72元D．50元9．若ab＞0，则函数y=ax+b与函数在同一坐标系中的大致图象可能是（）A．B．C．D．10．如图，直径为10的⊙A上经过点C（0，5）和点0（0，0），B是y轴右侧⊙A优弧上一点，则∠OBC的余弦值为（）A．B．C．D．11．如图，Rt△ABC中，∠C=90°，∠A=30°，AB=4，将△ABC绕点B按顺时针方向转动一个角到△A′BC′的位置，使点A、B、C′在同一条直线上，则图中阴影部分的周长是（）leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.Two,thecauseoftheproblemThroughtheanalysis,Ifeelthattherearemanyreasonsfortheseproblems.Oneideaisobsolete.Thefailuretodosystemresearchontheessenceofreadingtheoriginal,palmandmasterthetheoryofqualityreadwithoutthoroughunderstanding,hasnotbeeneffectively3A．4π+4B．4πC．2π+4D．2π12．如图，已知四边形OABC是菱形，CD⊥x轴，垂足为D，函数的图象经过点C，且与AB交于点E．若OD=2，则△OCE的面积为（）A．2B．4C．2D．4二、填空题（本题共4小题，每小题3分，共12分．）13．因式分解：a3﹣4a=．14．如图，在⊙O中，圆心角∠AOB=12O°，弦，则OA=cm．15．在数据1，2，3，1，2，2，4中，众数是．16．在△ABC中，AB=6，AC=8，BC=10，P为边BC上一动点，PE⊥AB于E，PF⊥AC于F，M为EF中点，则AM的最小值为．leadershipintentionandmeaningintothetext.Althoughhiseyesnowwriteonlyarelativelysmallnumberofmaterials,butalsoquitedifficult,eventoamoldingmaterialherselfseemsnotverysatisfiedwiththequalityofserviceneedstobeenhanced.Threeisalotofworktoimplementpassive,activeandadvanced.Mostcontractorsdomattersassignedbytheleadership,workisoftenintheorders,toimplementthetask,donotwanttolead,notwanttothinkahead,planahead,andtoseektheleadership;seekdeepintotheresearch,provideinformationgoodstaffseek.Especiallyinthewritingprocessofmaterial,itencounteredmuch,timetight,heavybetweentherequirements.Andintheencounterthetediouswork,complexthings,sometimestakethemethodofescape,thatbridgetheboattothebridgestraight,nottheirownforcepleasefindcountermeasures,buttowaitfortheself,thelackofaspiritofhardresearch.T