2015年辽宁省大连市高三双基测试文科数学 高三作文
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第一篇:《2015辽宁省大连市双基考试文科数学答案》
2015年大连市高三双基测试
数学(文科)参考答案与评分标准
说明:
一、本解答给出了一种或几种解法供参考,如果考生的解法与本解答不同,可根据试题的主要考查内容比照评分标准制订相应的评分细则.
二、对解答题,当考生的解答在某一步出现错误时,如果后继部分的解答未改变该题的内容和难度,可视影响的程度决定后继部分的给分,但不得超过该部分正确解答应得分数的一半;如果后继部分的解答有较严重的错误,就不再给分.
三、解答右端所注分数,表示考生正确做到这一步应得的累加分数. 四、只给整数分数,选择题和填空题不给中间分. 一.选择题
(1)A;(2)C;(3)D;(4)A;(5)D ;(6)D; (7)B;(8)C; (9)A;(10)D;(11) C;(12)b4b6的值为99(学生选B也给分). 二.填空题
(13)256;(14);(15
)k( ;(16)
三.解答题
(17)解:(1)∵(2ac)cosBbcosC0,
2acosBccosBbcosC0由正弦定理,
得2sinAcosBsinCcosBcosCsinB0. ·······································我们的未来作文······························ 2分 即2sinAcosBsin(CB)0,
5
4
sinA(2cosB1)0, ·············································································································· 4分
在ABC中,sinA0,2cosB10,B
3
. ························································· 6分
1
(2)令2x
B
3
, f(x)
13
···················展望未来作文············ 8分 sin2xcos2xsin(2x) , ·
223
5
(kZ) 12
3
2k
2
,kZ,得xk
即当xk
5
(kZ)时f(x)取最大值1. ······································································ 12分 12
(18)解:(Ⅰ)由表知甲流水线样本中合格品数为8+14+8=30,故甲流水线样本中合
30
格品的频率为=0.75 ···························· 2分
40(Ⅱ)从乙流水线上重量值落在505,515合格产品件数为0.02×5×40=4,
不合格产品件数为0.01×5×40=2.设A1,A2,A3,A4 , 不合格产品编号为B1,B2, 抽取2件产品的事件基本空间为
1{(A1,A2),(A1,A3)(A1,A4),(A1,B1),(A1,B2),(A2,A3),(A2,A4)(A2,B1), (A2,B2),(A3,A4),(A3,B1),(A3,B2),(A4,B1)(A4,B2)(B1,B2)}共15个
2{(A1,B1),(A1,B2),(A2,B1),(A2,B2),(A3,B1),(A3,B2),(A4,B1)(A4,B2)}共8
谁动了我的奶酪读后感个,概率P
8
. ······················ 8分 15
(Ⅲ)由(Ⅱ)知甲流水线样本中合格品数为30,乙流水线样本中合格品数为0.9×40=36.
2×2列联表如下:
2
∵K3.117>2.706,
a+bc+da+cb+d66×14×40×40
∴有90%的把握认为产品的包装质量与两条自动包装流水线的选择有关. ····· 12分
(19)解:(Ⅰ)由题知,棱柱的上下底面为菱形,则A1C1B1D1,
2
由棱柱性质可知CC1//B考古学家B1,又CC1A1C1,故A1C1BB1, 又B1D1平面DBB1D1,BB1平面DBB1D1,B1D1BB1B1,
A1C1平面DBB1D1,
又A1C1平面AA1C1C,故平面DBB1D1平面AA1C1C ······· 6分 (Ⅱ)设ACBDO,由(Ⅰ)可知AC平面DBB1D1, 故VCDD1B1B
1
SDD1B1BCO ····················· 8分 3
菱形ABCD中,因为BC2,DAB60,则CBO60,且BD2 则在CBO中, COBCsin60 ·············· 10分 易知四边形DBB1D1为边长为2的菱形,
SDD1B1BD1B1DD1sinDD1B22sinDD1B
则当DD1B90时(DD1D1B1),SDD1B1B最大,且其值为4.
14故所求体积最大值为V4 ············· 12分
33
(20) 解:(Ⅰ)设直线l1的方程为:xmy2,点A(x1,y1),B(x2,y2).
xmy2,
联立方程组2得y22pmy4p0,
y2px.
y1y22pmy,y1y24p.
k1k2
y1yy1y22my1y24(y1y2)
2 x12x22my14my24(my14)(my24)
8mp8mp
0. ······················································································· 4分
(my12)(my22)
32015年辽宁省大连市高三双基测试文科数学
(Ⅱ)设点P(x0,y0),直线PA:yy1
4py1y0
,
y1y0
y1y0
(xx1),当x2时,x1x0
yM
同理yN
4py2y0
. ························································································· 6分
y2y0
4py2y04py1y0
2,
y2y0y1y0
因为OMON2,4yNyM2,
22
16p24py0(y2y1)y0y1y216p28p2my04py0
2,2 22
y2y1y0(y2y1)y04p2pmy0y0
1
,抛物线C的方程y2x. ···································································· 12分 2
x1f(x)ex(a0)f(x)ex
(21) 解:(Ⅰ),则 aa
p
1x
1e0
令a,则xln
a
故函数f(x)的增区间为(,ln);减区间为(ln,). ······································· 4分
aa
112
(Ⅱ)当ln2,即0a2时,f(x)maxf(2)e2,
aea1111111
当1ln2时,即2a时,f(x)maxf(ln)ln,
aeeaaaa
111
当ln1时,即a时,f(x)maxf(1)e. ···················································· 8分
eaa
4
11111
(Ⅲ)若函数f(x)有两个零点,则f(ln)ln0,即a,
eaaaa
11
而此时,f(1)e0,由此可得x11lnx2,
aa11
故x2x1ln1,即x1x21ln,
aaxx
f(x1)1ex10,f(x2)2ex20又 aa
1
(1ln)x1ex1
x2ex1x2eaeln(ae)ae. ···················································· 12分 x2e
(22) 证明:(Ⅰ)连结AB,∵ABPE四点共圆,∴ABCE. 又∵ABCADC,∴ADCE,∴A,D,M,E四点公圆.5分 (Ⅱ)法一:连结BN,∵PNBPABC,BPNNPC,
PBPN
∴PNB∽PCN,,∴PN2PBPC. ···················· 10分 PNPC
法二:连结PN,AN.由(Ⅰ)知PDNE,∴PDNEPNA,
PDPN
DN∽PNA.N2PDPA又∵APNNPD,∴P∴,∴P,
PNPA
PBPC
PD,P ∴PN2PBPC. ······························ 10分
(23)解:(Ⅰ)直线l的极坐标方程为:sin()4,
3
x2cos.
C 曲线的参数方程为·························· 5分 (为参数). ·
ysin. (Ⅱ) 曲线C的点P(2cos.sin)到直线l
y20的距离
d
|sin2|
.
2d)2,tan. sin30
则PA
当sin()
1时,|PA|max2 ;
5
第二篇:《2015年大连市高三双基测试理科数学答案》2015年辽宁省大连市高三双基测试文科数学
2015年大连市高三双基测试
数学(理科)参考答案与评分标准
说明:
一、本解答给出了一种或几种解法供参考,如果考生的解法与本解答不同,可根据试题的主要考查内容比照评分标准制订相应的评分细则.
二、对解答题,当考生的解答在某一步出现错误时,如果后继部分的解答未改变该题的内容和难度,可视影响的程度决定后继部分的给分,但不得超过该部分正确解答应得分数的一半;如果后继部分的解答有较严重的错误,就不再给分.
三、解答右端所注分数,表示考生正确做到这一步应得的累加分数. 四、只给整数分数,选择题和填空题不给中间分.
一.选择题 (1)A;(2)C;(3)D;(4)A; (5)D;(6)D;(7)B;(8)C;(9)A;(10)D; (11) C; (12)B. 二.填空题 (13)
753(14);(15) ;16
. 945三.解答题
(17)解:(I)an1
an
, 2an1
2a1111n,化简得2, an1anan1an
即
111
2,故数列是以1为首项,2为公差的等差数列. ··············· 6分 an1anan
n(12n1)1
n2. ········· 8分 2n1,所以Sn
2an
(Ⅱ)由(I)知
证法一:
111111111
222
S1S2Sn12n1223n(n1)
1
111111n(1)()()1 ···························· 12分
223nn1n1n1
证法二:(用数学归纳法)当n1时,
111
不等式成立. 1,
n12S1
假设当nk时,不等式成立,即
111k
.
S1S2Skk1
则当nk1时,则又k
1111k1
, 2
S1S2SkSk1k1(k1)
1k11111k1110, 2222
k1(k1)k2k1(k1)k2k2(k1)(k2)(k1)
1111k1
,
S1S2SkSk1k2
·························································································· 12分 原不等式成立. ·证法三:
n111111
, 2221,又因为1
n1S1S2Sn12n
所以
111n
. ··································································· 12分
S1S2Snn1
(18)解:(Ⅰ)系统抽样.
这40辆小型汽车车速众数的估计值为87.5,中位数的估计值为87.5. ··· 2分
(Ⅱ)车速在[80,90)的车辆共有(0.2+0.3)×40=20辆,速度在[80,85),[85,90)内的车辆分别有8辆和12辆.
记从车速在[80,90)的车辆中任意抽取3辆车,车速在[80,85)内的有2辆,在[85,90)内的有1辆为事件A,车速在[80,85)内的有1辆,在[85,90)内的有2辆为事件B,
C8C12C8C1286472则P(A)+P(B)=33. ·············· 8分
C20C20114095(Ⅲ)车速在[70,80)的车辆共有6辆,车速在[70,75)和[75,80)的车辆分别有2辆和4辆,若从车速在[70,80)的车辆中任意抽取3辆,设车速在[75,80)的车辆数为X,则X的可能取值为1、2、3.2015年辽宁省大连市高三双基测试文科数学
21
12
22015年辽宁省大连市高三双基测试文科数学
C2×C441
P(X=1)=3,
C6205C2×C4123
P(X=2)=,
C6205C2×C441
P(X=3)=3,
C6205故分布列为
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