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322322初中畢學(xué)考試試數(shù)
學(xué)一選題本題10個(gè)小,小3分,30分)在小給的個(gè)項(xiàng),有項(xiàng)合目求請(qǐng)出在答卡將項(xiàng)黑1.在數(shù)軸上表示的離開原點(diǎn)的距離等于()A..
C.
D.
2.下列計(jì)算中,結(jié)果正確的是)A.a(chǎn)B.
C
6
.
623.學(xué)業(yè)考試體育測(cè)試結(jié)束后,班體育委員將本班50名生的測(cè)試成績制成如下的統(tǒng)計(jì)表.這個(gè)班學(xué)生體育測(cè)試成績的眾數(shù)是()成績(分)人數(shù)(人)
201
211
222
234
245
256
265
278
2810
296
302A.分B.分C.分D.人4.已知一個(gè)多項(xiàng)式與
3x
的和等于
x
,則這個(gè)多項(xiàng)式是()A.
B
5
C
x
D.
13x5.用配方法解方程A.
x
x
時(shí),原方程應(yīng)變形為()B.C
D.
B
A6.如圖,
ACBeq\o\ac(△,A)eq\o\ac(△,)
,則為()A.B30°C.7.如圖,在eq\o\ac(△,Rt)eq\o\ac(△,),,AB=10,以點(diǎn)
D.為圓心,
CCB
長為半徑的圓恰好經(jīng)過的中點(diǎn)D,AC的等于()A.3
B5C.
52
D.
C8.如果三角形的兩邊分別為3和5,那么連接這個(gè)三角形三邊中點(diǎn)所得的三角形的周長可能是()A...D.
A
DB9.如圖是半圓O的徑,點(diǎn)P從點(diǎn)O出,沿
的路徑運(yùn)動(dòng)一周.設(shè)為s運(yùn)動(dòng)時(shí)間為,下列圖形能大致地刻畫s與t間關(guān)系的是()P
sss
sA
O
B
O
A.
t
O
B.
t
O
C
t
O
D.
t第1頁
共12頁
......10.二行三列的方格棋盤上沿子的某條棱翻動(dòng)骰子(相對(duì)面上分別標(biāo)有1點(diǎn)6點(diǎn)2點(diǎn)和5點(diǎn)3點(diǎn)4點(diǎn)每種翻動(dòng)方式中,骰子不能后退.開始時(shí)骰子如圖)樣擺放朝的點(diǎn)數(shù)是最后翻動(dòng)到如(所示的位置此時(shí)骰子朝上的點(diǎn)數(shù)不可能是下列數(shù)中的()圖1)
圖)A..C.二選題本題10個(gè)小,小2分,20分)把案在中橫上按求答.算的果等于.
D.12.反比例函數(shù)的圖象經(jīng)過點(diǎn)
A
,則它的表達(dá)式是.13.以來,太原市城市綠化走了快車道.目前我市園林綠化總面積達(dá)到了7101.5萬平方米.這個(gè)數(shù)據(jù)用科學(xué)記數(shù)法表示為
萬平方米.14.程
5xx
的解是.15圖是一種貝殼的俯視圖
分線段
AB
近似于黃金分割知
ABAC的長約為到0.1
)16甲乙兩盞路燈底部間的距是30米一天晚上當(dāng)小華走到距路燈乙底部米處時(shí)發(fā)現(xiàn)己的身影頂部正好接觸路燈乙的底部.已知小華的身高為米,那么路燈甲的高為米.17.種品牌的手機(jī)經(jīng)過四、五份連續(xù)兩次降價(jià),每部售價(jià)由甲小華乙3200元降到了2500元.設(shè)平每月降價(jià)的率為,根據(jù)題意列出的方程是.18.圖、AC是的條弦,°,過點(diǎn)的線與的長線交于點(diǎn)D,則D度數(shù)為.
C19.兩把不同的鎖和三把鑰匙其中兩把鑰匙分別能打開其中一把鎖,第三把鑰匙不能打開這兩把鎖,任意取出一把鑰匙去開任意的一
B
D把鎖,一次打開鎖的概率為.20.圖,在等腰梯形ABCD中BC,AD=,=45°直角三角板含45°角的點(diǎn)E在上動(dòng),一直角邊始終經(jīng)過點(diǎn),邊與交于點(diǎn).若ABE為腰三角形,
AA
D
F則CF的等于.三解題本題9個(gè)小,)
B
E
C解應(yīng)出字明證過或算驟第2頁
共12頁
21小滿分分化簡:
2
22小滿分分已知二函數(shù)的表達(dá)式為
y4
寫出這個(gè)函數(shù)圖象的對(duì)稱軸和點(diǎn)坐標(biāo)求圖象與
軸的交點(diǎn)的坐標(biāo).23小滿分分某公司計(jì)劃生產(chǎn)甲乙種產(chǎn)品20其總產(chǎn)值(萬元滿<w,相關(guān)數(shù)據(jù)如下表.為此,公司應(yīng)怎樣設(shè)計(jì)這兩種產(chǎn)品的生產(chǎn)方案.產(chǎn)品名稱甲乙
每件產(chǎn)品的值(萬元457524小滿分分如圖,從熱氣球C上得兩建筑物A、底的俯角分別為30和果時(shí)氣球的高度CD為米.且點(diǎn)、D、B在一直線上,求建筑物、B間距離.EFA
D
B第3頁
共12頁
25小滿分分為了解某校學(xué)生每周購買瓶裝飲料的情況,課外活動(dòng)小組從全校個(gè)中采用科學(xué)的方法選了5個(gè)并隨機(jī)對(duì)這5班學(xué)生某一天購買瓶裝飲料的瓶數(shù)進(jìn)行了統(tǒng)計(jì)果如下圖所示.()該天這個(gè)平均每班購買飲料的瓶數(shù);()計(jì)該校所有班級(jí)每周(以5天)購買飲料的瓶數(shù);()每瓶飲料售價(jià)在1.5元2.5元之間,估計(jì)該校所有學(xué)生一周用于購買瓶裝飲料的費(fèi)用范圍.瓶數(shù)/瓶131211109876543210
ABCDE
班數(shù)26小滿分分如圖,是邊上一點(diǎn),AEON.()圖中作MON的平分線,交AE于B求尺規(guī)作圖,保留圖痕跡,不寫作法和證明)()1)中,過點(diǎn)
A
畫
的垂線,垂足為點(diǎn)
D
,交
ON
于點(diǎn)
,連接
CB
,將圖形補(bǔ)充完整,并證明四邊形OABC是形.MA
EO
N第4頁
共12頁
27(小題滿分分某中學(xué)九年級(jí)有8個(gè),要從選出兩個(gè)班代表學(xué)校參加社區(qū)公益活動(dòng).各班都想?yún)⒓?,但由于特定原因,一班必須參加,另外從二至八班中再選一個(gè)班.有人提議用如下的方法在一個(gè)品牌的四個(gè)乒乓球上分別標(biāo)上數(shù)字23并放入一個(gè)不透明的袋中搖后從中隨機(jī)摸出兩個(gè)乓球個(gè)球上的數(shù)字和是幾就選幾班你認(rèn)為這種方法公平嗎?請(qǐng)用列表或畫樹狀圖的方法說明理由.123428小滿分分A
、
B
兩座城市之間有一條高速公路,甲、乙兩輛汽車同時(shí)分別從這條路兩端的入口處駛?cè)耄⑹冀K在高速公路上正常行駛.甲車駛往B城乙車駛往城,甲車在行駛過程中速度始終不變距城速公路入口處的距離y(千米駛時(shí)間()之間的關(guān)系如圖.()y于x表達(dá)式;()知乙車以60千/時(shí)速度勻速行駛,設(shè)行駛過程中,兩車相距的路程為(千米請(qǐng)直接寫出關(guān)的達(dá)式;
s()乙車按()的狀態(tài)行駛與甲車相遇后,速度隨即改為a(千米時(shí)并保持勻速行駛,結(jié)果比甲車晚40分到達(dá)終點(diǎn),求乙車變化后的速度
.在下圖中畫出乙車離開城高速路入口處的距離(米行駛時(shí)間x(間的函數(shù)圖象.
千米36030024018012060O1234
5
/時(shí)29小滿分12分問解如圖(正方形紙片折,使點(diǎn)落邊上一點(diǎn)
A
M
F
D(不與點(diǎn)C,
D
重合后到折痕MN當(dāng)
1
時(shí),
E求
AM
的值.
B
N圖()
C第5頁
共12頁
方法指導(dǎo):為了求得
的值,可先求、
的長,不妨設(shè):
=2類歸在圖(),若
11AM的等于;若的等3BN4于若聯(lián)拓
1AM(為數(shù)的等于的子表示)n如形紙片
ABCD
折疊點(diǎn)
B
落在
CD
邊上一點(diǎn)
E不與點(diǎn)
,D
重合壓平后得到折痕MN
ABCEAM,的值等于含mn,
的式子表示)
FA
M
DEB
N圖()
C第6頁
共12頁
2山西省太生試試數(shù)學(xué)試題參答案一選題題號(hào)答案
1A
2C
3B
4A
5B
6B
7A
8D
9C
10D二填題.;.
y
x
;13.7.1015×
;
14.x(
15.;16.17.
(32
x或
2
)18.°
19.
20.,,
42
.三解題4x21.:原式xxxxx
····································2分=
······························································4分=1.·······················································································5分22.:在y4
中,
ab∴
bac22a4a第7頁共12頁
∴個(gè)函數(shù)圖象的對(duì)稱軸是
x
,頂點(diǎn)坐標(biāo)是:
2分評(píng)分說明:接寫出正確結(jié)果也得分.令=0,則
·····························································分解得,x····································································4分∴數(shù)圖象與
軸的交點(diǎn)的坐標(biāo)為
523.:設(shè)計(jì)劃生產(chǎn)甲產(chǎn)品件則生產(chǎn)乙產(chǎn)品
件,································1分根據(jù)題意,得··············································3分201200.解得
0
.···········································································4
為整數(shù),∴
x20
(件····································答:公司應(yīng)安排生產(chǎn)甲產(chǎn)品,乙產(chǎn)品9件··········································6分24.:由已知,得
ECAFCBCDEF,AB
于點(diǎn)
D
.30FCB60·········································2分在eq\o\ac(△,Rt)eq\o\ac(△,)中,CDA90=
,CD3AD90··············································4分tanA3在eq\o\ac(△,Rt)中90=
,CD90DB30·····························································6分tan3BD9030
(米答:建筑物B間距離為120米···················································8分25.)
第8頁
(瓶共12頁
答:該天這個(gè)平均每班購買飲料10瓶················································3分()
101500
(瓶答:該校所有班每周購買飲料瓶.······················································6分()
1.515002250(2.5
(元答:該校所有班級(jí)學(xué)生一周用于購買瓶裝飲料的費(fèi)用為2250元至3750元·······8分26.)如圖,射線OB為求作的圖形.·················································3分MA
B
EO
DCN()方一
平分MON.AEONAOBABO,····························································5ADOB···································································6,在△ADBCDO中BD,
,eq\o\ac(△,)ADB≌CDOABOC··························································7邊形
OABC
是平行四邊形.·········································8分四形OABC是形.···················································9分方二同方法一,
AOBABO···································5ADOB于D,∴6分,在AOD和COD,
ADOCDO∴
AODCODADCD·························································7∴邊形平行四邊形.···························································8分(AC∴邊形OABC是菱.··························27.:這種方法不公平.一次球可能出現(xiàn)的結(jié)果列表如下:····························4分123.
1(1,1(2,1(1
2(,2(,2(2
3.(,3(,3(,3
4(1,4)(2,4)(3.,4)第9頁
共12頁
4
(4,1
(,2
(,3
(4,4)由上表可知,一次摸球出現(xiàn)的結(jié)果共有種能的情況,且每種情況出現(xiàn)的可能性相同.其中和為的種,和兩種,和為的種,和為5的種,和為6的種,和為7的種和為的種.············································6分P
(和為2)P(為8)
2,P(為)(為7=168
,P
(和為4)P(為6)
41,P(為)164
.所以
31······································································7分16816因?yàn)槎嘀涟税喔靼啾贿x中的概率不全相等,所以這種方法不公平.··········8分評(píng)說:要出二至八班中有個(gè)班被選中的概率不相等,就可得.28.)方一由圖知
是
的一次函數(shù),設(shè)
ykx····························1分圖象經(jīng)過點(diǎn)0,∴
300,························2解得
k··········································································3分b∴
y300y關(guān)于的表達(dá)式為
y300··················方二由圖知,當(dāng)x時(shí)y;時(shí),.所以,這條高速公路長為300千.甲車2小的程為300-120=180(米∴車行駛速度為180÷(米/時(shí)·····································3分∴y關(guān)的達(dá)式為
y300x(yx
·················4分()
x········································································5()
中.當(dāng)s時(shí)x.即甲乙兩車經(jīng)過2小相.·························································6在
y300中當(dāng),
.所以,相遇后乙車到達(dá)終點(diǎn)所用的時(shí)間為
2
(小時(shí)
360
千米乙車與甲車相遇后的速度a
(千米時(shí)第10共12頁
30024018012060O
14
/時(shí)
M2222MM2222M∴90(米時(shí)······························分乙車離開
B
城高速公路入口處的距離
(千米)與行駛時(shí)間()之間的函數(shù)圖象如圖所示.···········9分29.問解解方一如圖(接
BMEMBE
.FADEB
N)
C由題設(shè),得四邊形
和四邊形
FENM
關(guān)于直線
對(duì)稱.∴垂平分BE.∴BMEMEN·····································1分∴邊形ABCD是方形,∴ABBCDA.∴
DENC2在
CNE
中,
NECE2
.∴
2
,即·········································3分在eq\o\ac(△,)和在eq\o\ac(△,Rt)DEM中AM2AB2
2
,
2
DE
2
EM
2
,AMABDE·····························································設(shè)AMy2y2解得
y
1AM·····································································6∴
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