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1、20XX 年四川初中数学联赛(初二组)决赛试卷及其解析(考试时间:20XX 年 3 月 24 日上午 8:4511:15)题号一二三四五合计得分评卷人复核人一、选择题(本大题满分42 分,每小题 7 分)1、设13x,则13xx的最大值与最小值的和()(A)0(B)1(C)2(D)3 解析:由条件13x,可得1324xxx,当1x,得最小值-2,当3x,得最大值2,故选 A 2、设5x,y是不超过 x的最大整数,求1xy=()(A)52(B)52(C)51(D)51解析:易得2y,代入代数式经分母有理化得52,故选 B.3、如图,已知在四边形ABCD 中,ACB=BAD=105,ABC=ADC
2、=45,则 CAD=()(A)65(B)70(C)75(D)80解析:此题由三角形内角和及角的构成容易得,答案为C.4、由 1、2、4 分别各用一次,组成一个三位数,这样的三位数中是4的倍数的三位数共有()(A)1 个(B)2 个(C)3 个(D)4 个解析:是 4 的倍数必然个位数不能是1,再将 124、142、214、412 试除以 4,便可得答案为B.5、已知:,x y z为三个非负实数,且满足325231xyzxyz,设37sxyz,则 s的最大值是()(A)111(B)111(C)57(D)75解析:由方程组解出737 11xzyz,由,x y非负实数,可解得37711z,373(7
3、3)711732sxyzzzzz,取711z代入即可求得,答案为A 6、如图,DAP=PBC=CDP=90,AP=PB=4,AD=3,则 BC的长是()D C B A(A)323(B)16(C)413(D)412解析:延长DP 交 CB 延长线于点E,如图,由三角形全等可证PE=DP,AD=BE,由勾股定理可求DP=5,故 DE=10,再由EBP EDC,可得EBEPEDEC,求得 EC=503,BC=EC-EB=503-3=413,答案 C 二、填空题(本大题满分28 分,每小题 7 分)1、关于 x 的不等式组3361xxax的解是13x,则 a的值是解析:解不等式组得313ax,故33,
4、123aa2、如果281pp与都是质数,则p解析:考虑到是初二竞赛,试值可求得P=3 3、设,x y为两个不同的非负整数,且213xyxy,则xy的最小值是解析:,x y为两个不同的非负整数,0213x,故x取 06 的整数,代入再求符合条件的y,符合条件的整数解只有024,1331xxxyyy三组,故xy的最小值为5.4、如图,已知 ABCD 为正方形,AEP 为等腰直角三角形,EAP=90,且 D、P、E 三点共线,若 EA=AP=1,PB=5,则 DP=解析:连结BE,易证 AE B APD,故 PD=EB,APD=AEB。AEP 为等腰直角三角形,EAP=90 AEP=APE=45 A
5、PD=13 5 故 AEB=135 PEB=AEB-AEP=135-45=90可求 PE=2,再由勾股定理可求得BE=3,所以 PD=3D P C B A E P B C D A E D P C B A E P B C D A 文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5
6、Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H
7、5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2
8、H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N
9、2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2
10、N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P
11、2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7
12、P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2文档编码:CA7P2N2H5Q10 HN1G8D10C2Z4 ZL4S10D3E4P2三、(本大题满分 20 分)设实数k满足01k,解关于 x的分式方程22111kkxxxx解22111kkxxxx221(1)(1)(1)(1)kxkxxxxxx x21(1)(1)kxkx5 分(1)kxk,又01k1kxk10 分当12k时,1x为增根,原方程无解15 分当01k且12k时,原方程的解是1kxk20 分四、(本大题满分 25 分)已知一次函数(0)ykxb k的图像与 x轴的正半轴交于E 点,与y轴的正半轴交于F 点,与
13、一次函数21yx的图像相交于 A(m,2),且 A 点为 EF 的中点.(1)求一次函数ykxb的表达式;(2)若一次函数21yx的图像与 x轴相交于 P点,求三角形 APE 的面积。解析:函数21yx过点 A(m,2)32mA 点坐标3(,2)25 分 A3(,2)2点为 EF 的中点.E(3,0)F(0,4)10 分 一次函数解析式为443yx15 分一次函数21yx的图像与x轴相交于 P 点,P1(,0)220 分如图:所以PE=52,PE 边上的高为2,5152222S25 分O P A F E y x 文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H
14、4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:
15、CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T
16、6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9
17、HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7
18、M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N
19、9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X
20、8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4五、(本大题满分 25 分)如图,已知 AB=A C,BAC=CDE=90,DC=DE,F是 BE的中点,求证:FA=FD且 FA FD 解析:连结AF、DF,并延长 AF至 G,使 FG=AF,连结 DG、EG BFEFAFBGFEFGFA AFB
21、 GFE AB=GE,B=FEG 5 分ABED为四边形,且 BAC=CDE=90,B+FED+CAD+CDA=180,又 C+CAD+CDA=180 C=B+FED=FEG+FED=GED 10 分又因为 GE=AB=AC,CD=ED ACD GED 15 分AD=GD,ADC=GDE 而 AF=GFAFDF20 分又 GDE+GDC=CDE=90 ADC+GDC=90 即 ADG=90 DF=AF 25 分文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R
22、2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C
23、9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10
24、S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C1
25、0N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB
26、9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S
27、3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4文档编码:CA1R2T6W5C9 HM10S7M5C10N9 ZB9X8S9S3H4