2011年全国高中数学联赛江西省预赛试题及标准答案.pdf
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1、1/8 2011年全国高中数学联赛江西省预赛试卷一、填空题(每小题10 分,共80分)1、2011是这样的一个四位数,它的各位数字之和为4;像这样各位数字之和为4的四位数总共有个2、设 数 列na满 足:121,2aa,且 对 于 其 中 任 三 个 连 续 项11,nnnaaa,都有:11(1)(1)2nnnnanaan.则通项na3、以抛物线2yx上的一点1,1M为直角顶点,作抛物线的两个内接直角三角形MAB与MCD,则线段AB与CD的交点E的坐标为4、设,1x y zRxyz,则函数23(,)f x y zxy z的最大值是5、0000sin 6 sin 42 sin66 sin786、
2、正三棱锥DABC的底面边长为4,侧棱长为8,过点A作与侧棱,DB DC都相交的截面AEF,那么,AEF周长的最小值是7、满足2272011xy的一组正整数(,)x y8、用()S n表示正整数n的各位数字之和,则20111()nS n二、解答题(共3题,合计70分)9、(20 分)、设0180ABC,且 满 足:sinsinsin1coscoscosABCABC,求cos2cos2cos2coscoscosABCABC的值2/8 10、(25分)如图,ABC的内心为I,,M N分别是,AB AC的中点,ABAC,内切圆I分别与边,BC CA相切于,D E;证明:,MN BI DE三线共点11、
3、(25分)在电脑屏幕上给出一个正2011边形,它的顶点分别被涂成黑、白两色;某程序执行这样的操作:每次可选中多边形连续的a个顶点(其中a是小于2011的一个固定的正整数),一按鼠标键,将会使这a个顶点“黑白颠倒”,即黑点变白,而白点变黑;(1)、证明:如果a为奇数,则可以经过有限次这样的操作,使得所有顶点都变成白色,也可以经过有限次这样的操作,使得所有顶点都变成黑色;(2)、当a为偶数时,是否也能经过有限次这样的操作,使得所有的顶点都变成一色?证明你的结论INMFEDCBA文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9
4、HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9
5、 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T
6、9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10
7、T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W1
8、0T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W
9、10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8
10、W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I103/8 解答1、20提示:这种四位数1234x x x x的个数,就是不定方程12344xxxx满足条件11x,234,0 xxx的整解的个数;即12343yxxx的非负整解个数,其中111yx
11、,易知这种解有4 133 4 1620CC个,即总共有20个这样的四位数(注:也可直接列举)2、23n 提示:由条件得,112(1)(1)nnnnanana,所以11(1)()(1)()nnnnnaanaa,故1111nnnnaanaan,而211aa;113212111221()12311113nnnnnnnnnnaaaaaaaaaaaaaaaannnnnn2(1)n n;于是12112()(1)1nnaan nnn;由此得112211()()()12(1)123nnnnnaaaaaaaann.3、(1,2)提示:设221122(,),(,)A x xB x x,则文档编码:CJ3W2E8W
12、10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8
13、W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E
14、8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2
15、E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W
16、2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3
17、W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ
18、3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I104/8 2111222211,111,1MAMBxkxxxkxx22121212ABxxkxxxx
19、,直线AB方程为21121()()yxxxxx,即1212()yxxxx x,因为MAMB,则12(1)(1)1xx,即12122()x xxx,代人方程得122()(1)yxxx,于是点(1,2)在直线AB上;同理,若设223344(,),(,)C xxD xx,则CD方程为342()(1)yxxx,即点(1,2)也在直线CD上,因此交点E的坐标为(1,2)E4、1432提示:由61223336,22 3 3 3xyzyyzzzxyy zz zx所以,623114 276xy z,即23431123432xy z,文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W
20、6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4
21、W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y
22、4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2
23、Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H
24、2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1
25、H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI1H2Y4W6I10文档编码:CJ3W2E8W10T9 HS10A9W9H2U8 ZI
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