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,#,/,19,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,年甘肃省,天,水市初,中,毕业与升学学,业,考试,(,中考),数学,考生,注,意,:,请,将,正,确,答,案,填涂,在,答,题,卡,上,,,全,卷,满,分,150,分,,,考,试时,间,120,分钟,.,A,卷,(,100,分,),一、选择题,(,本大题共,10,小题,每小题,4,分,共,40,分,.,每小题给出的四个选 项中,只有一个选项是正确的,请把正确的选项选出来,),1,.,下,列,四,个,实,数,中,,,是,负,数 的,是,(),A,.,(,3,),B,.,(,2,),2,C,.,4,D,.,5,2,.,天,水,市,某网,店,2020,年,父,亲节,这,天,的,营,业,额,为,341,000,元,,,将,数,341,000,用科,学,记,数,法 表 示,为,(,),A,.,3.41,10,5,B,.,3.41,10,6,C,.,341,10,3,D,.,0.341,10,6,3,.,某,正,方,体,的,每,个,面,上,都,有一,个,汉,字,,,如,图,是,它,的,一种,表,面,展,开,图,,,那,么,在,原正,方,体,中,,与“,伏,”,字,所,在,面,相,对,面,上 的,汉,字,是,(),A,.,文,B,.羲,第,3,题图,C,.弘,D,.,化,4,.,某,小,组,8,名,学,生,的,中,考,体育,分,数,如下,:,39,,,42,,,44,,,40,,,42,,,43,,,40,,,42,.,该组,数,据的 众 数,、,中,位,数,分,别,为,(),A,.,40,,,42B,.,42,,,43,C,.,42,,,42,D,.,42,,,41,5,.,如图所示,,PA,、,PB,分别,与,O,相,切于,A,、,B,两点,,点,C,为,O,上一点,连接,AC,、,BC,,,若,P,70,,,则,ACB,的 度,数 为,(),第,4,题图,C,.,6,0,A,.,50,B,.,55,D,.,6,5,6,.,下,列,图,形,中,,,是,中,心,对,称图,形,但,不,是,轴,对,称,图,形,的,是,(,),ABCD,7,.,若函数,y,ax,2,bx,c,(,a,0),的图象如,图,所,示,,则函数,y,ax,b,和,y,c,在同一,平,面,x,直 角,坐,标,系,中,的,图,象,大,致,是,(),第,7,题图,ABCD,8,.,如,图,所,示,,,某,校,数,学兴,趣小,组,利,用,标杆,BE,测,量,建,筑,物的,高,度,,,已,知,标,杆,BE,高,1.5,m,,测 得,AB,1.2,m,,,BC,12.8,m,,,则,建,筑,物,CD,的 高,是,(,),A,.,17.5,m,B,.,17,m,第,8,题图,C,.,16.5,m,D,.,18,m,9,.,若,关,于,x,的不,等,式,3,x,a,2,只有,2,个正,整,数,解,,,则,a,的,取,值,范,围,为,(,),A,.,7,a,4,C,.,7,a,4,B,.,7,a,4,D,.,7,a,4,10,.,观,察,等,式,:,2,2,2,2,3,2,;,2,2,2,2,3,2,4,2,;,2,2,2,2,3,2,4,2,5,2,;,已,知,按,一定,规,律,排,列,的,一,组,数:,2,100,,,2,101,,,2,102,,,2,199,,,2,200,,,若,2,100,S,,,用,含,S,的式,子 表,示,这,组,数,据,的,和,是,(),A,.,2,S,2,S,B,.,2,S,2,S,C,.,2,S,2,2,S,D,.,2,S,2,2,S,2,二、填空题,(,本大题共,8,小题,每小题,4,分,共,32,分,.,只要求填写最后结果,),分,解,因,式:,m,3,n,mn,.,一,个,三,角,形,的,两,边,长分,别为,2,和,5,,,第,三,边,长,是,方,程,x,2,8,x,12,0,的,根,则,该,三,角,形的,周,长,为,.,毕业,学,校,姓,名,考,生,号,在,此,-,卷,上,答,题,无,效,数学试卷 第 1 页(共 6 页)数学试卷 第 2 页(共,1,/,19,数,学,试卷,第,3,页(,共,6,页,),第,22,题图,数学,试,卷,第,4,页,(,共,6,页),x,3,13,.,函,数,y,x,2,中,,自,变量,x,的取,值范,围,是,.,33,14,.,已,知,a,2,b,10,,,3,a,4,b,16,,,则,a,b,的,值,为,.,如,图,所,示,,AOB,是,放,置,在正,方形,网,格,中,的,一,个,角,,,则,sin,AOB,的值,是,.,如,图,所,示,,,若,用,半,径为,8,,,圆,心,角,为,120,的,扇,形,围,成,一,个圆,锥,的,侧,面,(,接,缝,忽,略不,计,),,则这,个,圆,锥,的,底,面,半,径,是,.,第,15,题图第,16,题图第,17,题图第,18,题图,如,图,,,将,正,方,形,OEFG,放在,平,面直,角,坐,标,系,中,,,O,是坐,标原,点,,,点,E,的,坐,标,为,(,2,3,),,,则点,F,的坐,标,为,.,如,图,,,在,边,长为,6,的,正,方,形,ABCD,内,作,EAF,45,,,AE,交,BC,于点,E,,,AF,交,CD,于点,F,,,连,接,EF,,,将,ADF,绕点,A,顺时,针,旋,转,90,得,到,ABG,,,若,DF,3,,,则,BE,的长,为,.,三、解答题(本大题共,3,小题,共,28,分,.,解,答时写出必要的文字说明及演算 过程),1,1,4,19,.(,8,分,)(,1,)(,4,分,)计,算:,4sin,60,|,3,2,|,2020,0,12,.,(,2,)(,4,分,),先,化,简,,,再,求值:,1,a,1,a,1,,,其,中,a,3,.,a,1,a,2,2,a,1,a,1,20,.(,10,分,),为,了,解,天,水,市民,对,全,市,创,建,全,国,文,明,城市,工,作,的,满,意,程,度,,,某,中学,数学,兴,趣小,组,在,某,个,小,区,内,进,行,了调,查,统,计,.,将,调,查,结,果分,为不,满,意,,,一般,,,满意,,,非常满 意四,类,,,回,收,、,整,理,好,全,部问,卷,后,,,得,到,下,列,不,完,整的,统,计,图.,请结,合,图,中,的,信,息,,,解,决,下列,问,题,:,(,1,),此,次,调,查,中,接,受,调查,的人,数,为,人;,请,你,补,全,条,形,统,计图,;,扇,形,统,计,图,中,“,满意,”部,分,的,圆,心,角,为,度,;,该,兴,趣,小,组,准,备,从,调,查结,果,为,“,不,满,意,”,的,4,位市,民,中,随,机,选,择,2,位,进,行回,访,,已知这,4,位,市,民,中有,2,位,男性,,,2,位,女,性,.,请,用,画,树,状图,的,方,法,求,出,选,择,回,访,的市民,为,“,一,男,一,女,”,的,概,率,.,21,.(,10,分,),如,图,所,示,,,一,次函数,y,mx,n,(,m,0,),的,图,象,与,反,比,例,函,数,y,k,(,k,0,),的,x,图象,交,于,第二,、,四,象,限的,点,A,(,2,a,),和点,B,(,b,1,),,,过,A,点作,x,轴的,垂线,,,垂,足,为,点,C,,,AOC,的,面积,为,4,.,分,别,求出,a,和,b,的值,;,结,合,图,象,直,接,写,出,mx,n,k,中,x,的取,值,范,围;,x,在,y,轴上,取,点,P,,使,PB,PA,取,得,最大,值,时,,,求,出,点,P,的坐,标,.,第,21,题图,B,卷(,50,分),四、解答题(本大题共,50,分,解答时写出必要的演算步骤及推理过程),22,.(7,分,),为,了,维,护,国,家,主权,和,海,洋,权,力,,,海,监,部,门对,我,国,领,海,实,现,了,常,态,化巡,航,管,理,.,如图,所,示,,,正,在,执,行,巡,航,任务,的,海,监,船,以,每,小,时,40,海里,的,速,度,向,正,东,方,向,航,行,,,在,A,处测,得,灯塔,P,在,北,偏,东,60,方,向,上,,继,续,航,行,30,分,钟,后,到,达,B,处,,,此,时,测,得,灯塔,P,在北,偏,东,45,方向,上,.,求,APB,的度,数;,已,知,在,灯塔,P,的,周,围,25,海里,内,有,暗,礁,,,问海,监,船继,续,向,正,东方,向,航,行是,否安,全,?(,参,考,数,据,:,2,1.414,,,3,1.732,),数学试卷 第 3 页(共 6 页)第 22 题图x 31,2,/,19,数学,试,卷,第,5,页,(,共,6,页),数,学,试卷,第,6,页,(共,6,页),23,.(,10,分,),如,图,,,在,ABC,中,,C,90,,,AD,平,分,BAC,交,BC,于点,D,,,点,O,在,AB,上,以,点,O,为圆心,,OA,为半径的圆恰好,经,过点,D,,分别交,AC,、,AB,于点,E,、,F,.,试,判,断,直,线,BC,与,O,的,位置,关系,,,并,说,明,理,由,;,若,BD,2,3,,,AB,6,,,求,阴,影,部,分,的,面积,(,结,果,保,留,).,第,23,题图,24,.(,10,分),性质探,究,如,图,(,1,),,在,等,腰,三,角,形,ABC,中,,ACB,120,,,则底边,AB,与腰,AC,的,长度,之比,为,.,图(,1,),图(,2,),第,24,题图,理解运,用,若,顶,角,为,120,的,等,腰,三,角形,的周,长,为,4,2,3,,则,它,的,面,积,为,;,如,图,(,2,),,在,四,边形,EFGH,中,,EF,EG,EH,.,在边,FG,,,GH,上,分,别,取,中 点,M,,,N,,,连,接,MN,.,若,FGH,120,,,EF,20,,,求,线段,MN,的,长,.,类比拓,展,顶角,为,2,的,等,腰,三,角,形,的,底,边与,一,腰,的,长,度,之,比,为,(,用,含,的,式,子,表示,),25,.(,10,分,),天,水,市,某,商,店准,备,购进,A,、,B,两种,商,品,,A,种商,品,每,件,进,价,比,B,种商,品,每 件的,进价,多,20,元,,用,2 000,元,购进,A,种,商,品,和,用,1,200,元购进,B,种,商,品,的,数,量,相,同,.,商店将,A,种,商,品,每,件,的,售,价,定为,80,元,,B,种,商,品,每,件,的,售价,定,为,45,元,.,A,种,商,品,每,件,的,进,价,和,B,种商,品,每,件,的,进,价,各,是,多,少元,?,商,店,计,划,用,不,超,过,1,560,元,的,资,金,购进,A,、,B,两,种商,品共,40,件,,,其,中,A,种商品 的数,量,不,低,于,B,种商,品,数,量,的一,半,,,该,商,店,有,几,种,进,货方,案?,(,3,),“,五,一,”,期,间,,,商,店,开,展优,惠促,销,活,动,,,决,定对,每,件,A,种,商,品,售,价,优,惠,m,(,10,m,20,),元,,B,种商品售价不变,在(,2,)的条件下,请设计出,m,的不同 取值,范,围,内,,,销,售,这,40,件,商品,获,得,总,利,润,最,大,的,进,货方,案,.,26,.(,13,分,),如,图,所,示,,,抛,物线,y,ax,2,bx,c,(,a,0),与,x,轴,交,于,A,、,B,两,点,,,与,y,轴交,于,点,C,,,且点,A,的,坐,标为,A,(,2,0),,,点,C,的坐标,为,C,(0,6),,,对,称,轴,为,直,线,x,1,.,点,D,是抛,物,线,上,一,个,动,点,,,设,点,D,的,横,坐,标,为,m,(1,m,4),,,连接,AC,,,BC,,,DC,,,DB,.,(
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