2022-2023學(xué)年天津開發(fā)區(qū)一中高二(下)期中數(shù)學(xué)試卷
發(fā)布:2024/6/18 8:0:10
一、單選題。(本大題共12小題,共36.0分)
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1.設(shè)雙曲線C以橢圓
長(zhǎng)軸的兩個(gè)端點(diǎn)為焦點(diǎn),以橢圓的焦點(diǎn)為頂點(diǎn),則雙曲線C的方程為( )x225+y29=1A. x225-y29=1B. x216-y24=1C. x216-y29=1D. x29-y216=1組卷:87引用:5難度:0.7 -
2.下列對(duì)函數(shù)求導(dǎo)運(yùn)算正確的是( ?。?/h2>
A.(sin )′=cosπ3π3B.(e2x)′=e2x C.( )′=cosxxxsinx-cosxx2D.(2ex)′=2ex 組卷:157引用:3難度:0.7 -
3.設(shè)f′(x)是函數(shù)f(x)的導(dǎo)函數(shù),y=f′(x)的圖象如圖所示,則y=f(x)的圖象最有可能的是( ?。?/h2>
A. B. C. D. 組卷:2124引用:195難度:0.9 -
4.已知直線l1:mx-3y+6=0,l2:4x-3my+12=0,若l1∥l2,則l1,l2之間的距離為( ?。?/h2>
A. 121313B. 81313C. 91313D. 13組卷:231引用:3難度:0.8 -
5.已知等差數(shù)列{an}的公差為2,若a1,a3,a4成等比數(shù)列,Sn是{an}的前n項(xiàng)和,則S9等于( ?。?/h2>
A.-8 B.-6 C.10 D.0 組卷:654引用:21難度:0.9 -
6.已知二項(xiàng)式(2x2-
)n的所有二項(xiàng)式系數(shù)之和等于128,那么其展開式中含1x項(xiàng)的系數(shù)是( )1xA.-84 B.-14 C.14 D.84 組卷:413引用:20難度:0.7 -
7.已知等比數(shù)列{an}中,a4=2,則a1a2…a7=( ?。?/h2>
A.8 B.14 C.128 D.256 組卷:407引用:6難度:0.8
三、解答題。(本大題共4小題,共40.0分。解答應(yīng)寫出文字說明,證明過程或演算步驟)
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20.已知橢圓C:
+x2b2=1(a>b>0)的離心率為y2a2,橢圓C的長(zhǎng)軸長(zhǎng)為4.32
(1)求橢圓C的方程;
(2)已知直線l:y=kx+與橢圓C交于A,B兩點(diǎn),是否存在實(shí)數(shù)k使得以線段AB為直徑的圓恰好經(jīng)過坐標(biāo)原點(diǎn)O?若存在,求出k的值;若不存在,請(qǐng)說明理由.3組卷:127引用:11難度:0.3 -
21.已知函數(shù)f(x)=x2-2alnx,其中(a∈R),
(1)當(dāng)函數(shù)f(x)在(1,(1))處切線斜率為0時(shí),求函數(shù)f(x)在[,e]上的最值;1e
(2)討論函數(shù)f(x)的單調(diào)性;
(3)若函數(shù)f(x)有兩個(gè)零點(diǎn),求a的取值范圍.組卷:148引用:1難度:0.6