2022年中考数学走出题海之黄金30题系列专题考前必做难题30题 .pdf
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2022年中考数学走出题海之黄金30题系列专题考前必做难题30题 .pdf
专题 06 考前必做难题 30 题一、选择题1一组数2,1,3,x,7,y,23,如果满足“从第三个数起,若前两个数依次为a、b,则紧随其后的数就是2a b”,例如这组数中的第三个数“3”是由“221”得到的,那么这组数中y 表示的数为()(A)9 (B)1 (C)5 (D)21【答案】A【解析】从第三个数起,前两个数依次为a、b,紧随其后的数就是2a-b,23-x=7,x=-1,则 2(-1)-7=y,解得 y=-9 故选 A2已知二次函数yax2 bxc(a0)的图象如图,则下列结论:a,b 同号;当x1 和 x3 时,函数值相等;4ab0;当 y 2 时,x 的值只能为0,其中正确的个数是()A1 个 B 2 个 C 3 个 D 4 个【答案】B 3 ABC的周长为30 cm,把 ABC的边 AC对折,使顶点C和点 A 重合,折痕交BC边于点 D,交 AC边于点 E,连接 AD,若 AE 4 cm,则 ABD的周长是A22 cm B 20 cm C 18 cm D 15 cm【答案】A【解析】由折叠可得:AD=CD,AE=CE,因为 ABC的周长为30 cm,AE 4 cm,所以AB+AC=30-8=22cm,所以ABD的周长=AB+BD+AD=AB+BD+CD=AB+AC=22cm,故选 A4如图,OAC和BAD都是等腰直角三角形,90ADBACO,反比例函数y=xk在第一象限的图象经过点B,若1222ABOA,则 k 的值为()A4 B 6 C8 D 12【答案】B 5正方形 ABCD 中,点 P从点 C出发沿着正方形的边依次经过点D,A向终点 B运动,运动的路程为x(cm),PBC的面积为 y(2cm),y 随 x 变化的图象可能是()BCADP【答案】A【解析】P在 CD上运动时,y 随 x 的增大而增大;P在 AD上运动时,y 保持不变;P在 AB上运动时,y 随 x的增大而减小;故选 A 文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J16如图,已知ABC(AC BC),用尺规在BC上确定一点P,使 PA+PC=BC 则下列四种不同方法的作图中准确的是()【答案】D【解析】D选项中作的是AB的中垂线,PA=PB,PB+PC=BC,PA+PC=BC 故选 D7如图,正方形ABCD的对角线相交于O,点 F 在 AD上,AD=3AF,AOF的外接圆交AB于 E,则AFAE的值为()FCBAOEDA23 B3 C35 D 2【答案】D【解析】连接EO、FO,如图,四边形ABCD为正方形,BAD=90,BOA=90,AOD=90,FOE=90(圆内接四边形的对角互补),AOD=90,DOF=AOE,又 FDO=OAE=45,DOF AOE,DF=AE,AD=3AF,FD=2AF,AE=2AF,2AEAF故选 D.文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J18如图 1,在平面内选一定点O,引一条有方向的射线Ox,再选定一个单位长度,那么平面上任一点M的位置可由 MOx的度数与OM的长度 m确定,有序数对(,m)称为 M点的“极坐标”,这样建立的坐标系称为“极坐标系”在图 2 的极坐标系下,如果正六边形的边长为2,有一边OA在射线 Ox上,则正六边形的顶点C的极坐标应记为()A(60,4)B(45,4)C(60,2 2)D(50,2 2)【答案】A【解析】如图,设正六边形的中心为D,连接 AD,ADO=360 6=60,OD=AD,AOD是等边三角形,OD=OA=2,AOD=60,OC=2OD=22=4,正六边形的顶点C的极坐标应记为(60,4)故选 A9如图,在矩形纸片ABCD 中,AB=5CM,BC=10CM,CD上有一点 E,ED=2cm,AD上有一点P,PD=3cm,过点P作 PF AD,交 BC于点 F,将纸片折叠,使点P与点 E重合,折痕与PF交于点 Q,则 PQ的长是().A.413 cm B.3cm C.2cm D.27cm【答案】A.【解析】过Q点作 QG CD,垂足为G点,连接QE,设 PQ=x,由折叠及矩形的性质可知,EQ=PQ=x,QG=PD=3,EG=x-2,在 Rt EGQ 中,由勾股定理得:EG2+GQ2=EQ2,即:(x-2)2+32=x2,解得:x=134,文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1即 PQ=134.故选 A.10如图,已知正方形ABCD,点 E是边 AB的中点,点O是线段 AE上的一个动点(不与A、E 重合),以 O为圆心,OB为半径的圆与边AD相交于点M,过点 M作 O的切线交DC于点 N,连接 OM、ON、BM、BN 记MNO、AOM、DMN 的面积分别为S1、S2、S3,则下列结论不一定成立的是()AS1S2+S3 B AOM DMN C MBN=45 D MN=AM+CN【答案】A【解析】(1)如答图1,过点 M作 MP AO交 ON于点 P,点 O是线段 AE上的一个动点,当 AM=MD 时,S梯形 ONDA=12(OA+DN)?ADS MNO=12MP?AD,12(OA+DN)=MP,SMNO=12S梯形 ONDA,S1=S2+S3,不一定有S1S2+S3.故 A不一定成立.(2)MN是 O的切线,OM MN,又四边形ABCD为正方形,A=D=90,AMO+DMN=90,AMO+AOM=90.AOM=DMN.在 AMO 和 DMN 中,ADAOMDMN,AMO DMN 故 B成立.文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1(3)如答图2,过点 B作 BP MN于点 P,MN,BC是 O的切线,PMB=12MOB,CBM=12MOB.AD BC,CBM=AMB.AMB=PMB.在 RtMAB 和 RtMPB中,BPMBAMPMBAMBBMBM,Rt MAB RtMPB(AAS).AM=MP,ABM=MBP,BP=AB=BC.在 RtBPN和 RtBCN中,BPBCBNBN,RtBPN RtBCN(HL).PN=CN,PBN=CBN.MBN=MBP+PBN.MN=MN+PN=AM+CN故 C,D成立.综上所述,A不一定成立.故选 A11如图,直角三角形纸片ABC中,AB 3,AC 4,D 为斜边 BC中点,第1 次将纸片折叠,使点A与点 D重合,折痕与AD交与点 P1;设 P1D的中点为D1,第 2 次将纸片折叠,使点A与点 D1重合,折痕与AD交于点P2;设 P2D1的中点为D2,第 3 次将纸片折叠,使点A与点 D2重合,折痕与AD交于点 P3;设 Pn1Dn 2的中点为 Dn1,第 n 次将纸片折叠,使点A与点 Dn1重合,折痕与AD交于点 Pn(n 2),则 AP6的长为()A.5125 32 B.69352 C.614532 D.711352【答案】A 文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1【解析】由题意得,AD 12BC 52,AD1 AD DD1 AD 14AD 34AD 158,AD2AD DD1D1D2AD 14AD 316AD916AD25532,AD337532,ADn21532nn.故 AP154,AP21516,AP326532APn12532nn.当 n6时,AP65125 32.故选 A.12在矩形ABCD中,AB=1,AD=3,AF平分 DAB,过 C点作 CEBD于 E,延长 AF、EC交于点 H,下列结论中:AF=FH;B0=BF;CA=CH;BE=3ED;正确的个数为()(A)1 个 (B)2个 (C)3个 (D)4个【答案】C【解析】根据已知条件不能推出AF=FH,故错误;四边形ABCD是矩形,BAD=90,AD=3,AB=1,tan ADB=3331,ADB=30,ABO=60,四边形ABCD 是矩形,AD BC,AC=BD,AC=2AO,BD=2BO,AO=BO,ABO是等边三角形,AB=BO,AOB=BAO=60=COE,AF平分 BAD,BAF=DAF=45,ADBC,DAF=AFB,BAF=AFB,AB=BF,AB=BO,BF=BO,故正确;BAO=60,BAF=45,CAH=15,CE BD,CEO=90,EOC=60,ECO=30,H=ECO-CAH=30-15=15=CAH,AC=CH,故正确;文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S9T2Y8 HE1C3L10V3T4 ZE4K10X8O7J1文档编码:CE1X3S