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基礎(chǔ)專題練習(xí)六一、選擇題(共16分,每題2第1-8題均有四個選項,符合題意的選項只有一個.1.下面幾何體中,是圓柱的是2.根據(jù)地區(qū)生產(chǎn)總值統(tǒng)一核算的結(jié)果,2022年北京市全年地區(qū)生產(chǎn)總值41610.9億元,按不變價格計算,比2021年增長0.7%.將4090000000用科學(xué)計數(shù)法表示應(yīng)為41.6109114.16109114.1610912D4.1610913()(A)3.如圖,點(diǎn)O在直線AB上,OCOD,若AOC50,則(A)1204.下列圖形都是軸對稱圖形,其中恰有4條對稱軸的圖形是()B()C=BOD的度數(shù)是()130()140(D)1505.a,b在數(shù)軸上的對應(yīng)點(diǎn)的位置如圖所示,則正確的結(jié)論是(A)a?2()ab()ab0(D)a?bk6.平面直角坐標(biāo)系xOy(x,2)和B(x,4)在反比例函數(shù)y=(k0)12x的是(A)xx0()xx0()xx0(D)xx021122112mx+3x?1=0有兩個不相等的實(shí)數(shù)根,則實(shí)數(shù)m的取值范圍是27.x的方程9494949(A)m?()m?()m?且m0(D)m?m0且48.n為正整數(shù)且1nn年該設(shè)備檢修支出的費(fèi)用總和(單位:萬元)滿足關(guān)系式y(tǒng)=1.4n-0.5,下列結(jié)論正確的是(A)從第2年起,每年的檢修費(fèi)用比上一年增加1.4()從第2年起,每年的檢修費(fèi)用比上一年減少萬元()第1年至第5年平均每年的檢修費(fèi)用為(D)第6年至第10年平均每年的檢修費(fèi)用為1.4萬元二、填空題(共16分,每題29.若x?1在實(shí)數(shù)范圍內(nèi)有意義,則實(shí)數(shù)x的取值范圍是__________.10.分解因式:3x2?12=__________.若n邊形的每一個外角都等于°,則n的值是__________.1112.=的解為__________.2xx?113.如圖,在中,E是邊上的點(diǎn),連接交于點(diǎn)FFD__________.14.“圓”是中國文化的一個重要精神元素,在中式建筑中有著廣泛的應(yīng)用,例如古典園林中的門洞,如圖,某地園林中的一個圓弧形門洞的高為2.5m,地面入口款為1m,則該門洞的半徑為__________m.15.有61346隨機(jī)抽取1隨機(jī)抽取1張,則第二次取出的數(shù)字是第一次取出數(shù)字的整數(shù)倍的概率是__________.16.AB,C三種原料每袋的重量(單位:kg)依次是1,,,每袋的價格(單位:萬元)依次是,2,5.現(xiàn)生產(chǎn)某種產(chǎn)品需要ABC這三種原料的袋數(shù)依次為x,x,x(x,x,x123123品時需要的這三類原料的總重量(單位:kg(用含x,x,x312的品質(zhì),要求W13,當(dāng)x,x,x3的值依次是_______時,這種產(chǎn)品的成本最低.12三、解答題17.計算:?3?4sin60+27?+.4x?3x?18.解不等式組:2x+6.519.a是方程x2+2x?1=0的一個根,求代數(shù)式(a+2+a(a+2)的值.20.下面是解答一道幾何題時兩種添加輔助線的方法,選擇其中一種,完成證明.已知:如圖,AB求證:AEC=A+C方法一方法二證明:如圖,過點(diǎn)E作MN∥證明:如圖,延長AECD21.在中,AD是邊上的中線,點(diǎn)E在線段上,點(diǎn)F在線段的延長線上,CEFB,連接BE,CF.(1)如圖1,求證:四邊形BFCE是平行四邊形.(2=ACB,①依題意補(bǔ)全圖2;②求證:四邊形BFCE為菱形22.某地旅游部門為了促進(jìn)本地生態(tài)特色城鎮(zhèn)和新農(nóng)村建設(shè),將甲、乙、丙三家民宿的相關(guān)資料放到某網(wǎng)絡(luò)滿意度”評分,評分越高表明游客體驗越好,現(xiàn)從這三家民宿“綜合滿意度”的評分中各隨機(jī)抽取10個評分?jǐn)?shù)據(jù),并對所得數(shù)據(jù)進(jìn)行整理、描述和分析,下面給出了部分信息。a.甲、乙兩家民宿“綜合滿意度”評分的折線圖:b.丙家民宿“綜合滿意度”評分:2.64.74.55.05.14.85.54.84.5c.甲、乙、丙三家民宿“綜合滿意度”評分的平均數(shù)、中位數(shù):甲乙m丙4.54.7平均數(shù)4.2中位數(shù)4.5n根據(jù)以上信息,回答下列問題:(1)表中m的值是__________,n的值是__________;(大小關(guān)系;s2甲,s2乙,2s2甲,s2乙,2之間的(3)根據(jù)“綜合滿意度”的評分情況,該平臺打算將甲、乙、丙三家民宿中的一家置頂推薦,你認(rèn)為該平臺會將這三家民宿中的哪家置頂推薦?說明理由(至少從兩個方面說明).123.在平面直角坐標(biāo)系xOyy=ax+b(a0)的圖象由函數(shù)y=x2(?.點(diǎn)(1)求這個一次函數(shù)的解析式:(2x2時,對于x的每一個值,一次函數(shù)取值范圍.y=ax+by=x+m的值小于漢書的值,直接寫出m的基礎(chǔ)練習(xí)專題六答案一、選擇題(共16分,每題2題號答案12345678BCCBDACD二、填空題(共16分,每題29.x1.10.x+2)(x?2)..9..x-.1713...1.3...16.x+2x+3x1,,1.12336817-205題6-23524-26題,每題6分,第-28題,每題717.解:?3?4sin60+27?(+.03=3?4+33?1········································································4分2=23?1.······················································································5分4x?3≥x?1①②18.解:+2x6.5解不等式①,得x≥0.···········································································2分解不等式②,得x2.···········································································4分所以原不等式組的解集為x2.·······························································5分(a++a(a+219.解:=a=2a∵a是方程2+2a+1+a+4a+1··················································································3分x2+2x?1=0的一個根,2a10,即2+2a·········································································2分2∴a2+?=+2a=1························································4a2.分∴原式=21+1=3.········································································5分20.方法一證明:如圖,過點(diǎn)E作MNAB.∴∠=AEM.··········································································2分∵AB∥CD,∴MNCD.∴∠=CEM.·······························4分∵∠AEC=∠+CEM,∴∠AEC=∠A∠.·····················5分方法二證明:如圖,延長AE于點(diǎn)F.∵AB∥CD,∴∠=AFC.································2分∵∠AEC=∠AFC+C,··················4分∴∠AEC=∠A∠.·····················5分21)證明:∵CE∥FB,∴∠BFE=CEF.∵是BC邊上的中線,∴BDDC.∵∠=CDE,∴△≌△CDE.∴FB=CE.∴BFCE是平行四邊形.·················································3分()①依題意補(bǔ)全圖2,如圖;②證明:∵ABC=ACB,∴ABAC.∵是邊上的中線,∴⊥BC.∵BFCE是平行四邊形,∴四邊形BFCE為菱形.······················································6分22)4.5,4.5;·················································································2分s2<s2<s2;·········································································3分()乙甲丙(3)推薦乙,理由略,答案不唯一,合理即可.······································5分123)∵一次函數(shù)yaxb的圖象由函數(shù)y=x的圖象平移得到,=+211y=x+b∴a=

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