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1、12013 年普通高等学校招生全国统一考试(北京卷)数学(理科)第一部分(选择题共 40 分)一、选择题:本大题共 8 小题,每小题 5 分,共 40 分,在每小题给出的四个选项中,选出符合题目要求的一项(1)【2013 年北京,理1,5 分】已知集合101A,|11Bxx,则ABI()(A)0(B)10,(C)01,(D)101,【答案】B【解析】1,0,1111,|0 xxI,故选 B(2)【2013 年北京,理2,5 分】在复平面内,复数22i对应的点位于()(A)第一象限(B)第二象限(C)第三象限(D)第四象限【答案】D【解析】2()2i34iQ,该复数对应的点位于第四象限,故选D(
2、3)【2013 年北京,理3,5 分】“”是“曲线sin 2yx过坐标原点”的()(A)充分而不必要条件(B)必要而不充分条件(C)充分必要条件(D)既不充分也不必要条件【答案】A【解析】,sin 2sin2()yxx,曲线过坐标原点,故充分性成立;(sin 2)yx过原点,sin0,k,kZ 故必要性不成立,故选A(4)【2013 年北京,理4,5 分】执行如图所示的程序框图,输出的S 值为()(A)1(B)23(C)1321(D)610987【答案】C【解析】依次执行的循环为1S,i0;23S,i1;1321S,i2,故选 C(5)【2013 年北京,理 5,5 分】函数 fx 的图象向右
3、平移1 个单位长度,所得图象与曲线exy关于y轴对称,则fx()(A)1ex(B)1ex(C)1ex(D)1ex【答案】D【解析】依题意,fx 向右平移 1 个单位之后得到的函数应为xye,于是 fx 相当于xye向左平移1 个单位的结果,1xfxe,故选 D(6)【2013 年北京,理6,5 分】若双曲线22221xyab的离心率为3,则其渐近线方程为()(A)2yx(B)2yx(C)12yx(D)22yx【答案】B【解析】由离心率为3,可知3ca,2ba渐近线方程为2byxxa,故选 B(7)【2013 年北京,理7,5 分】直线l过抛物线2:4C xy 的焦点且与y轴垂直,则l与 C 所
4、围成的图形的面积等于()(A)43(B)2(C)83(D)1623【答案】C【解析】由题意可知,l 的方程为1y如图,B点坐标为2,1,精品资料-欢迎下载-欢迎下载 名师归纳-第 1 页,共 5 页 -2所求面积232200842424123xxSdx,故选 C(8)【2013 年北京,理 8,5 分】设关于 x,y的不等式组21000 xyxmym,表示的平面区域内存在点00P xy,满足0022xy,求得 m 的取值范围是()(A)43,(B)13,(C)23,(D)53,【答案】C【解析】图中阴影部分表示可行域,要求可行域内包含112yx上的点,只需要可行域的边界点()mm,在112yx
5、下方,也就是112mm,即23m,故选 C第二部分(非选择题共 110分)二、填空题:共6 小题,每小题5 分,共 30 分(9)【2013 年北京,理9,5 分】在极坐标系中,点26,到直线sin2 的距离等于【答案】1【解析】在极坐标系中,点2,6对应直角坐标系中坐标为3,1,直线2sin对应直角坐标系中的方程为2y,所以点到直线的距离为1(10)【2013 年北京,理10,5 分】若等比数列na满足2420aa,3540aa,则公比q;前 n项和nS【答案】2;122n【解析】由题意知352440220aaqaa 由222421()10(12aaaqa qq,12a 12 122212n
6、nnS(11)【2013 年北京,理 11,5 分】如图,AB为圆 O 的直径,PA为圆 O 的切线,PB与圆 O 相交于D,若3PA,:9:16PDDB,则PD_;AB_【答案】95,4【解析】设9PDk,则0()16DBk k由切割线定理可得,2PAPD PB,即23925kk,可得15k95PD,5PB在 Rt APB 中,AB=224ABPBPA(12)【2013 年北京,理12,5 分】将序号分别为1,2,3,4,5 的 5 张参观券全部分给4 人,每人至少1 张,如果分给同一人的2 张参观券连号,那么不同的分法种数是_【答案】96【解析】连号有 4 种情况,从 4 人中挑一人得到连
7、号参观券,其余可以全排列,则不同的分法有1343496C A(种)(13)【2013 年北京,理13,5 分】向量ar,br,cr在正方形网格中的位置如图所示,若cabRrrr,则_【答案】4【解析】可设 aij,i,j为单位向量且ij,则62bij,3cij由()()62cabij,6123,解得212,4abc精品资料-欢迎下载-欢迎下载 名师归纳-第 2 页,共 5 页 -文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3
8、ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A
9、6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3
10、ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A
11、6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3
12、ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A
13、6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3
14、ZO9F4T9S8M23(14)【2013 年北京,理14,5 分】如图,在棱长为2 的正方体1111ABCDABC D中,E为 BC 的中点,点P在线段1D E上,点P到直线1CC的距离的最小值为_【答案】2 55【解析】过E点作1EE垂直底面1111A BC D,交11B C于点1E,连接11D E,过P点作PH垂直于底面1111A BC D,交11D E于点H,P点到直线 CC1的距离就是1C H,故当1C H垂直于11D E时,P点到直线1CC距离最小,此时,在111Rt D C E中,111C HD E,1111111D E C HC D C E,122 555C H三、解答题:共6
15、 题,共 80 分解答应写出文字说明,演算步骤或证明过程(15)【2013 年北京,理15,13 分】在ABC中,3a,2 6b,2BA(1)求 cosA 的值;(2)求 c 的值解:(1)因为3a,2 6b,2BA,所以在ABC 中,由正弦定理得32 6sinsin2AA所以2sin cos26sin3AAA故 cos63A(2)由(1)知,cos A=63,所以231cossin3AA又因为2BA,所以2cos2cos131BA2221con3ssiBB 在ABC 中,5sinsinsin coscos sin3()9CABABABsin5sinaCcA(16)【2013 年北京,理16,
16、13 分】下图是某市3 月 1 日至 14 日的空气质量指数趋势图,空气质量指数小于100 表示空气质量优良,空气质量指数大于200 表示空气重度污染某人随机选择3 月 1 日至 3 月 15 日中的某一天到达该市,并停留2 天(1)求此人到达当日空气重度污染的概率;(2)设X是此人停留期间空气质量优良的天数,求X的分布列与数学期望;(3)由图判断从哪天开始连续三天的空气质量指数方差最大?(结论不要求证明)解:设iA表示事件“此人于 3 月i日到达该市”1,2)13(i,根据题意,113iP A,且ijAAijI(1)设B为事件“此人到达当日空气重度污染”,则58BAAU58582()13P
17、BP AAPAPAU(2)由题意可知,X所有可能取值为0,1,2,且0115()()()123P XP XP X;36711367114()()113P XP AAAAP AP AP AP AUUU;1212131212134()()132P XP AAAAP AP AP AP AUUU所以 X 的分布列为:X 012 P 513413413故 X 的期望5441201213131313EX(3)从 3 月 5 日开始连续三天的空气质量指数方差最大(17)【2013 年北京,理 17,14 分】如图,在三棱柱111ABCAB C中,11AAC C是边长为 4 的正方形 平面 ABC平面11AA
18、C C,3AB,5BC(1)求证:1AA平面 ABC;EPDCBAC1B1A1D1空气质量指数日期14 日13日12 日11 日10 日9 日8 日7日6日5日4日3日2日1日03779861581211602174016022014357258650100150200250C1B1A1ABC精品资料-欢迎下载-欢迎下载 名师归纳-第 3 页,共 5 页 -文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2
19、文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5
20、U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2
21、文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5
22、U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2
23、文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5
24、U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2
25、4(2)求证二面角111ABCB的余弦值(3)证明:在线段1BC上存在点D,使得1ADAB,并求1BDBC的值解:(1)因为11AAC C为正方形,所以1AAAC因为平面ABC平面11AAC C,且1AA垂直于这两个平面的交线 AC,所以1AA平面 ABC(2)由(1)知1AAAC,1AAAB由题知3AB,5BC,4AC,所以 ABAC 如图,以 A 为原点建立空间直角坐标系Axyz,则0,3,0B,10,0,4A,10,3,4B,14,0,4C设平面11A BC的法向量为()xyzn,则11100A BACuu uruu uu rnn,即34040yzx令3z,则0 x,4y,所以0,4,3
26、n 同理可得,平面11B BC的法向量为3,4,0m所以 cosn,m=16cos,|25n mn mnm由题知二面角111ABCB为锐角,所以二面角111ABCB的余弦值为1625(3)设()D xyz,是直线1BC上一点,且1BDBCuuu ruuu u r,所以343,4()()xyz,解得4x,33y,4z所以4()334ADuuu r,由10AD A Buuu r uuu r,即 9250,解得925因为9250,1,所以在线段1BC上存在点D,使得1ADAB此时,1925BDBC(18)【2013 年北京,理18,13 分】设 l 为曲线ln:xCyx在点 1,0 处的切线(1)求
27、 l 的方程;(2)证明:除切点1,0 之外,曲线 C 在直线 l 的下方解:(1)设ln xfxx,则21ln xfxx所以11f所以L的方程为1yx(2)令1g xxfx,则除切点之外,曲线C 在直线L的下方等价于()001g xxx,g x 满足10g,且22ln11xxxxgfx 当 01x时,210 x,ln0 x,所以0gx,故 g x 单调递减;当1x时,210 x,ln0 x,所以0gx,故 g x 单调递增所以,1001()g xgxx,所以除切点之外,曲线C 在直线L的下方(19)【2013 年北京,理19,14 分】已知,A B C是椭圆22:14xWy上的三个点,O 是
28、坐标原点(1)当点B是 W 的右顶点,且四边形OABC 为菱形时,求此菱形的面积;(2)当点B不是 W 的顶点时,判断四边形OABC 是否可能为菱形,并说明理由解:(1)椭圆2214xWy:右顶点 B 的坐标为2,0 因为四边形OABC 为菱形,所以 AC 与 OB 相互垂直平分所以可设()1Am,代入椭圆方程得2114m,即32m所以菱形 OABC 的面积是1223212OB ACm(2)假设四边形OABC 为菱形因为点B不是 W 的顶点,且直线AC 不过原点,所以可设AC 的方程为0)0(ykxm km,由2244xyykxm,消y并整理得222()148440kxkmxm设11()A x
29、y,22()C xy,则1224214xxkmk,121222214yyxxmkmk所以 AC 的中点为224,1414kmmMkk因为M为 AC 和 OB 的交点,所以直线OB 的斜率为14k精品资料-欢迎下载-欢迎下载 名师归纳-第 4 页,共 5 页 -文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6
30、H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 Z
31、O9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6
32、H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 Z
33、O9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6
34、H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 Z
35、O9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M25因为114kk,所以 AC 与 OB 不垂直所以OABC 不是菱形,与假设矛盾所以当点B不是 W
36、的顶点时,四边形OABC 不可能是菱形(20)【2013 年北京,理20,13 分】已知na是由非负整数组成的无穷数列,该数列前n 项的最大值记为nA,第 n 项之后各项12,nnaaL的最小值记为nB,nnndAB(1)若na为2,1,4,3,2,1,4,3,是一个周期为4 的数列(即对任意*nN,4nnaa),写出1234,d dd d的值;(2)设 d 是非负整数,证明:1,2,3ndd nL的充分必要条件为na是公差为 d 的等差数列;(3)证明:若12a,11,2,3,ndnL,则na的项只能是1 或者 2,且有无穷多项为1解:(1)121dd,343dd(2)(充分性)因为na是公
37、差为 d 的等差数列,且0d,所以12naaa因此nnAa,1nnBa,11,2,3()nnndaad n,(必要性)因为(01,2,3)nddn,所以nnnnABdB 又因为nnaA,1nnaB,所以1nnaa于是,nnAa,1nnBa,因此1nnnnnaaBAdd,即na是公差为 d 的等差数列(3)因为12a,11d,所以112Aa,1111BAd故对任意1n,11naB假设2nan中存在大于2 的项设 m 为满足2ma的最小正整数,则2m,并且对任意 1km,2ka又因为12a,所以12mA,且2mmAa于是,211mmmBAd,12mmmBmin aB,故111220mmmdAB,与
38、11md矛盾所以对于任意1n,有2na,即非负整数列na的各项只能为1 或 2因为对任意1n,12naa,所以2nA故211nnnBAd因此对于任意正整数n,存在 m 满足mn,且1ma,即数列na有无穷多项为1精品资料-欢迎下载-欢迎下载 名师归纳-第 5 页,共 5 页 -文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文
39、档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U
40、2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文
41、档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U
42、2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文
43、档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2文档编码:CN1A6H1L7H7 HD5U2D9I9H3 ZO9F4T9S8M2