2021年2021年2018-2019学年福建省厦门市第一中学高一上学期入学考试数学试题(含答案解析).pdf
2018-2019 学年福建省厦门市第一中学高一上学期入学考试数学试题一、单选题1计算2(3)的结果等于()A5 B5C9 D9【答案】D【解析】根据有理数的乘方法则求出即可.【详解】原式9故选:D【点睛】本题考查有理数幂的运算,基础题.2函数42yx中自变量x的取值范围是()A2xB2xC2xD2x【答案】D【解析】求函数自变量的取值范围,就是求函数解析式有意义的条件,分式有意义的条件是:分母不等于0.【详解】根据题意得:20 x,解得:2x,故选:D【点睛】本题考查分式函数中自变量的取值条件,即为定义域,基础题.3cos30的值等于()A22B32C1 D3【答案】B【解析】根据特殊角的三角函数值直接解答即可.【详解】|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 1 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 1 页,共 18 页根据题意得;3cos302o故选:B【点睛】本题考查特殊角三角函数值的求法,属于基础题.4下列图形中,可以看作是中心对称图形的是()ABCD【答案】A【解析】根据中心对称图形的定义,分析判断各个选项,即可求解.【详解】在平面内,把一个图形绕着某个点旋转180o,如果旋转后的图形能与原来的图形重合,那么这个图形叫做中心对称图形.A.是中心对称图形,故本选项符合题意;B.不是中心对称图形,故本选项不符合题意;C.不是中心对称图形,故本选项不符合题意;D.不是中心对称图形,故本选项不符合题意.故选:A【点睛】本题考查中心对称的定义,演绎推理证明方法,属于基础题.5如图,天平右盘中的每个砝码的质量都是1g,则物体A的质量()m g的取值范围,在数轴上可表示为()ABCD【答案】A【解析】根据天平中物体的质量表示出m的取值范围,再在数轴上表示出来即可.【详解】|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 2 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 2 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 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ZK7F4J4W7G4Q由图可知,12gmg,在数轴上表示为:故选:A【点睛】本题通过天平比较,考查了交集运算的数轴表示,属于基础题.6把分式方程11122xxx的两边同时乘以(2)x,约去分母,得()A1(1)1xB1(1)1xC1(1)2xxD1(1)2xx【答案】D【解析】根据题意,分母中2x与2x互为相反数,那么最简公分母为2x,乘以最简公分母,可以把分式方程转化成整式方程.【详解】根据题意,方程两边都乘2x,得:1(1)2xx故选:D【点睛】本题考查分式方程的求法,分式转化的重要方法,为学习函数做准备,基础题.7若点123,6,2,2A xB xC x在反比例函数12yx的图像上,则123,x xx的大小关系是()A123xxxB213xxxC231xxxD321xxx【答案】B【解析】根据反比例函数图象上点的坐标特征,将A,B,C三点的坐标代入反比例函数的解析式12yx,分别求得1x,2x,3x的值,然后再比较大小.【详解】Q点1,6A x,2,2B x,3,2C x在反比例函数12yx的图像上,12x,26x,36x,|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 3 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 3 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 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ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4又626Q213xxx.故选:B【点睛】本题考查函数求值,已知函数解析式代入函数值可求自变量的值,属于基础题.8在圆环形路上有均匀分布的四家工厂甲?乙?丙?丁,每家工厂都有足够的仓库供产品储存.现要将所有产品集中到一家工厂的仓库储存,已知甲?乙?丙?丁四家工厂的产量之比为 1235.若运费与路程?运的数量成正比例,为使选定的工厂仓库储存所有产品时总的运费最省,应选的工厂是()A甲B乙C丙D丁【答案】D【解析】本题可先设出相邻两个工厂间的距离,以及甲?乙?丙?丁四厂的产量,然后分别计算出以甲?乙?丙?丁为仓库时,各自路程与运量的乘积的和,由于运费与路程,运量成正比,因此当所求的和最小时,运费最少,由此可判断出正确的选项.【详解】设相邻两个厂之间的路程为a,甲的产量为b;若仓库在甲,那么(路程运量)的和为:26513abababab;若仓库在乙,那么(路程运量)的和为:31014abababab;若仓库在丙,那么(路程运量)的和为:2259abababab;若仓库在丁,那么(路程运量)的和为:438abababab;由于运费与路程,运的数量成正比例,因此当运费最少时,应选的工厂是丁.故选:D【点睛】本题考查分类讨论思想,考查分类加法计数原理,属于基础题.9如图,在正方形ABCD中,,E F分别为,AD BC的中点,P为对角线BD上的一个动点,则下列线段的长等于APEP最小值的是()|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 4 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 4 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4AABBDECBDDAF【答案】D【解析】连接CP,当点E,P,C在同一直线上时,APPE的最小值为CE长,依据ABFCDE,即可得到APEP最小值等于线段AF的长.【详解】如图,连接CP,由,45ADCDADPCDPo,DP可DP,得ADPCDP,APCP,APPECPPE,当点E,P,C在同一直线上时,APPE的最小值为CE长,此时,由,ABCDABFCDE BFDE,可得ABFCDE,AFCE,APEP最小值等于线段AF的长.故选:D【点睛】本题考查几何中距离最小值的求法,考查两点之间线段最短,属于基础题.10已知抛物线2yaxbxc(,a b c为常数,0a)经过点(1,0),(0,3),其对称轴在y轴右侧,有下列结论:抛物线经过点(1,0);方程22axbxc有两个不相等的实数根;33ab.其中,正确结论的个数为()A0 B1 C2 D3【答案】C【解析】由抛物线过点()1,0-,对称轴在y轴右侧,即可得出当1x时0y,结论 错误;|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 5 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 5 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4过点0,2作x轴的平行线,由该直线与抛物线有两个交点,可得出方程22axbxc有两个不相等的实数根,结论正确;由当1x时0y,可得出abc,由抛物线与y轴交于点0,3,可得出3c,进而即可得出3ab,由抛物线过点()1,0-可得出2abac,结合0a,3c可得出3ab,综上可得出33ab,结论 正确,此题得解.【详解】Q抛物线过点()1,0-,对称轴在y轴右侧,当1x时0y,结论 错误;过点0,2作x轴的平行线,如图所示.Q该直线与抛物线有两个交点,方程22axbxc有两个不相等的实数根,结论正确;Q当1x时0yabc,abc.Q抛物线2yaxbxc,a b c(为常数且0a)经过点0,3,3c,3ab.Q当1x时,0y,即0abc,bac,2abac.Q抛物线开口向下,0a,3abc,33ab,结论 正确.故选:C|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 6 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 6 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 ZK7F4J4W7G4【点睛】本题考查二次函数性质,需分析对称轴、零点、判断参数范围,属于中等题.二、填空题11不透明袋子中装有11个球,其中有6 个红球,3 个黄球,2 个绿球,这些球除颜色外无其他差别.从袋子中随机取出1 个球,则它是红球的概率是_.【答案】611【解析】根据概率的求法,找准两点:全部情况的总数;符合条件的情况数目;二者的比值就是其发生的概率.【详解】Q袋子中共有11个球,其中红球有6个摸出一个球是红球的概率是611故答案为:611【点睛】本题考查概率基本求法,属于基础题.12如图,在Oe中,弦1ABcm,圆周角30ACB,且AD为Oe的直径,则BD的长为 _cm.【答案】3【解析】由题意知,弧长为1所对的圆周角为30o,则弧对的圆心角为60o,由于弧与圆心构成的三角形是等腰三角形,所以当圆心角为60o,这个三角形是等边三角形,边长已知,易得半径,得直径,再根据勾股定理,即可求解.【详解】连接OA和OB,1,30ABACBoQ|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 7 页,共 18 页|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 7 页,共 18 页文档编码:CY6A8Z2S5S7 HB6O9A9L8S4 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