,#,/,12,BC,数学,试,卷,第,1,页,(,共,6,页),数,学,试卷,第,2,页,(共,6,页),绝,密,启用,前,2020,年浙江省,杭,州,市,初,中,学业,水,平考试,数学,一,.,选,择,题:,本,题,共,10,小,题,,,每,小,题,3,分,,,共,30,分,.,在,每,小,题,给,出,的,四,个,选项,中,,,只有 一项,是,符,合,要,求,的,.,1,.,2,3,A,.,5,B,.,6,C,.,2,3,(),D,.,3 2,3,.,已,知,某,快,递,公,司,的,收,费,标准,为,:,寄,一,件,物,品,不超,过,5,千克,,,收,费,13,元,;,超,过,5,千,克的 部分,每,千,克加,收,2,元,.,圆圆,在该,快,递,公,司,寄一,件,8,千,克的,物,品,,,需,要,付费,(,),A,.,17,元,B,.,19,元,C,.,21,元,D,.,23,元,4,.,如,图,,在,ABC,中,,C,90,,,设,A,,,B,,,C,所对,的,边,分,别,为,a,,,b,,,c,,,则,(),2,.,1,y,1,y,(,),C,.,若,h,6,,,则,a,0,D,.,若,h,7,,,则,a,0,A,.,1,y,2,B,.,-,1,y,2,C,.,1,y,2,D,.,1,y,2,9,.,如,图,,,已,知,BC,是,O,的,直,径,,,半,径,OA,BC,,,点,D,在劣弧,AC,上,(,不,与,点,A,,,点,C,(第,4,题),A,.,c,b,sin,B,5,.,若,a,b,,则,A,.,a,1,b,B,.,b,c,sin,B,C,.,a,b,tan,B,D,.,b,c,tan,B,(),B,.,b,1,a,C,.,a,1,b,1,D,.,a,1,b,1,6,.,在,平,面,直,角坐,标,系,中,,,已,知,函,数,y,ax,a,a,0,的,图象,过,点,P,1,2,,,则,该,函,数,的图,象,可,能,是(),A,D,7,.,在,某,次,演,讲,比,赛,中,,,五,位评,委,给,选,手,圆,圆,打,分,,,得到,互,不,相,等,的,五,个,分,数,.,若去,掉,一个 最高,分,,,平,均,分为,x,;,去,掉,一个,最,低,分,,,平,均,分为,y,;,同时,去,掉,一,个,最,高,分,和,一个,最,低分,,,平,均,分为,z,,则,A,.,y,z,x,B,.,x,z,y,C,.,y,x,z,(),D,.,z,y,x,8,.,设,函,数,y,a,x,h,2,k,(,a,,,h,,,k,是实,数,,a,0,),,,当,x,1,时,,,y,1,;,当,x,8,时,,y,8,,,(,),A,.,若,h,4,,,则,a,0,B,.,若,h,5,,,则,a,0,重合,),,BD,与,OA,交,于,点,E,.,设,AED,,,AOD,,则,(,),(第,9,题),B,.,2,180,D,.,2,90,A,.,3,180,C,.,3,90,10,.,在,平,面,直,角,坐,标,系,中,,,已知,函,数,y,x,2,ax,1,,,y,x,2,bx,2,,,y,x,2,cx,4,,,123,123,其,中,a,,,b,,,c,是正,实,数,,,且,满,足,b,2,ac,.,设,函,数,y,,,y,,,y,的,图,象与,x,轴,的,交点个,数分,别,为,M,1,,,M,2,,,M,3,,,A,.,若,M,1,2,,,M,2,2,,则,M,3,0,B,.,若,M,1,1,,,M,2,0,,则,M,3,0,C,.,若,M,1,0,,,M,2,2,,则,M,3,0,D,.,若,M,1,0,,,M,2,0,,则,M,3,0,(),二,.,填空题:本大题有,6,个小,题,,每小题,4,分,共,24,分,.,11,.,若,分式,1,的,值等,于,1,,,则,x,.,x,1,毕业,学,校,姓,名,考,生,号,在,此,卷,上,答,题,无,效,BC数学试卷 第 2 页(共 6 页)绝密启用前一.选择,1,/,12,数,学,试卷,第,3,页(,共,6,页,),数学,试,卷,第,4,页,(,共,6,页),12,.,如,图,,,AB,CD,,,EF,分,别,与,AB,,,CD,交,于,点,B,,,F,.,若,E,30,,,EFC,130,,,则,A,.,13,.,设,M,x,y,,,N,x,y,,,P,xy,.,若,M,1,,,N,2,,则,P,.,14,.,如图,,,已,知,AB,是,O,的直径,,,BC,与,O,相切于,点,B,,,连,接,AC,,,OC,.,若,sin,BAC,1,,,则,tan,BOC,.,3,(,第,12,题,)(第,14,题,)(第,15,题,),15,.,一,个,仅,装,有,球,的,不,透明,布袋,里共,有,4,个,球,(,只有,编号,不,同,),,编,号,分别,为,1,,,2,,,3,,,5,.,从,中,任,意,摸,出,一,个,球,,,记下,编,号,后,放,回,,,搅,匀,,,再任,意,摸,出,一,个,球,,,则,两,次,摸出,的 球的,编,号,之,和,为,偶,数,的,概,率,是,.,16,.,如,图,是,一,张,矩,形,纸,片,,,点,E,在,AB,边上,,,把,BCE,沿直,线,CE,对,折,,,使点,B,落在,对,角,线,AC,上,的,点,F,处,,,连,接,DF,.,若点,E,,,F,,,D,在,同,一,条,直,线,上,,,AE,2,,,则,DF,,,BE,.,三,.,解答,题,:本大題有,7,个小,题,,共,66,分解答应写出文字说,明,、证明过程或,演算步,骤,.,17,.,(,本,题,满分,6,分,),以下,是,圆,圆,解,方,程,x,1,x,3,1,的解,答,过,程,.,23,解:,去,分,母,,,得,3,x,1,2,x,3,1,.,去括,号,,,得,3,x,1,2,x,3,1,.,移,项,,,合,并,同,类,项,,,得,x,3,.,圆圆,的,解,答,过,程,是,否,有,错,误,?,如,果,有,错,误,,,写,出,正,确的,解,答,过,程,.,18,.,(,本,题,满分,8,分,),某工,厂,生,产,某,种,产,品,,,3,月,份的,产,量,为,5,000,件,,,4,月,份,的产,量,为,10,000,件,.,用,简,单,随,机抽样的,方,法分,别,抽取,这,两个月生,产,的该,产,品若,干,件进行检,测,,并,将,检测,结,果分,别,绘制,成,如,图,所,示,的,扇,形,统,计图,和,频,数,直,方,图,(,每,组,不含,前,一,个,边,界,值,,,含,后,一个,边,界,值,),.,已,知,检,测,综,合,得,分大,于,70,分,的,产,品,为,合,格,产品,.,求,4,月,份,生,产,的,该产,品抽,样,检,测,的,合,格,率,;,在,3,月,份,和,4,月,份生,产的,产,品,中,,,估,计,哪,个,月,的不,合,格,件,数,最,多,?,为,什,么?,(第,18,题,),19,.,(,本,题,满分,8,分,),如,图,,,在,ABC,中,,,点,D,,,E,,,F,分,别,在,AB,,,BC,,,AC,边,上,,,DE,AC,,,EF,AB,.,求,证,:,BDE,EFC,.,设,AF,1,,,FC,2,若,BC,12,,,求,线,段,BE,的长,.,若,EFC,的面,积,是,20,,,求,ABC,的,面,积,.,(第,19,题,),数学试卷 第 3 页(共 6 页)数学试卷 第 4 页(共,2,/,12,(,3,),设,函,数,y,1,和函数,y,2,的,最小,值分,别,为,m,和,n,,,若,m,n,0,,,求,m,,,n,的值,.,数学,试,卷,第,5,页,(,共,6,页),数,学,试卷,第,6,页,(共,6,页),20,.,(,本,题,满分,10,分,),设函数,y,k,,,y,k,(,k,0),.,1,x,2,x,(,1,),当,2,x,3,时,,,函数,y,1,的,最,大,值,是,a,,,函,数,y,2,的最,小,值,是,a,4,,,求,a,和,k,的,值,.,(,2,),设,m,0,,,且,m,1,,当,x,m,时,,y,1,p,;当,x,m,1,时,,y,1,q,.,圆圆说:“,p,一,定,大,于,q,”,.,你,认,为,圆圆,的说,法,正,确,吗,?,为,什,么?,21,.,(,本,题,满分,10,分,),如,图,,,在,正,方,形,ABCD,中,,,点,E,在,BC,边,上,,,连,接,AE,,,DAE,的,平,分线,AG,与,CD,E,B,边交,于,点,G,,,与,BC,的延,长,线,交,于点,F,.,设,CE,(,0),.,若,AB,2,,,1,,,求,线,段,CF,的长,.,连接,EG,,若,EG,AF,,,求,证,:,点,G,为,CD,边的,中,点,.,求,的值,.,(第,21,题,),22,.,(,本,题,满分,12,分,),在平,面,直,角,坐,标,系,中,,,设二,次函数,y,x,2,bx,a,,,y,ax,2,bx,1,(,a,,,b,是实,数,,,12,a,0,),.,(,1,),若,函,数,y,1,的对,称,轴,为直,线,x,3,,,且,函,数,y,1,的图,象,经,过,点,a,b,,,求,函数,y,1,的表,达式,.,12,x,(,2,),若,函数,y,的,图,象,经,过,点,r,0,,,其,中,r,0,,,求,证,:,函数,y,的,图象,经过,点,1,0,.,23,.,(,本,题,满分,12,分,),如图,,,已知,AC,,,BD,为,O,的两,条直,径,,,连,接,AB,,,BC,,,OE,AB,于点,E,,,点,F,是半,径,OC,的,中,点,,,连接,EF,.,设,O,的半,径,为,1,,,若,BAC,30,,,求线段,EF,的,长,.,连接,BF,,,DF,,,设,OB,与,EF,交,于,点,P,,,求,证,:,PE,PF,.,若,DF,EF,,,求,BAC,的度,数,.,(第,23,题,),在,此,卷,上,答,题,无,效,毕业,学,校,姓,名,考,生,号,(3)设函数 y1 和函数 y2 的最小值分别为m 和n,,3,/,12,2020,年浙江省,杭,州市初,中,学业,水,平考,试,数,学答,案,解析,一,【,答,案,】,B,【解,析,】,根,据,二,次,根,式,的,乘法,运,算,法,则,进,行,运,算,即,可,解:,2,3,6,,,故选,:,B,【,答,案,】,C,【解,析,】,直,接,利,用,平,方,差,公式,计,算,得,出,答,案,解:,1,y,1,y,1,y,2,故选,:,C,【,答,案,】,B,【解,析,】,根,据,题,意,列,出,算,式计,算,,,即,可,得,到,结,果,解:,根,据,题,意,得,:,13,8,5,2,13,6,19,(,元,),则需,要付,费,19,元,故选,:,B,【,答,案,】,B,【解,析,】,根,据,三,角,函,数,的,定义,进,行,判,断,,,就,可,以,解,决问,题,解:,Rt,ABC,中,,C,90,,,A,、,B,、,C,所,对,的,边,分别,为,a,、,b,、,c,,,sinB,b,,,即,b,c,sin,B,,,故,A,选,项,不,成,立,,,B,选,项,成,立,;,c,tan,B,b,,,即,b,a,tan,B,,,故,C,选,项,不,成,立,,,D,选,项,不,成,立,a,故选,:,B,【,答,案,】,C,【解,析,】,举,出,反,例,即,可,判,断,A,、,B,、,D,,,根,据,不,等式,的传,递,性,即,可,判,断,C,解,:,A,、,a,0.5,,,b,0.4,,,a,b,,,但,是,a,-,1,b,,,不,符合,题,意,;,B,、,a,3,,,b,1,,,a,b,,,但,是,b,1,a,,不,符,合,题,意,;,C,、,a,b,,,a,1,b,1,,,b,1,b,1,,,a,1,b,1,,符,合,题,意;,D,、,a,0.5,,,b,0.4,,,a,b,