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高三数学高职考专题复习高考函数问题专题复习.doc

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1、Learn General Secretary on two to learn a strengthening four Consciousnesses important speech caused a strong reaction in the country. Time, watching red treasure, the origin of building the party back to power, how to strengthen services for the masses, improve party cohesion, fighting to become th

2、e grass-roots party members and masses hot topic. Grass-roots party organizations two is to strengthen the service of party members and cadres, the pioneer spirit. Distribution of grass-roots party organizations in all walks of people, clothing, shelter, which belongs to the nerve endings of the par

3、ty organization and comments reputation has a direct perception of the masses. Strengthen the party ahead of the pedal spirit; strengthen the party members and cadres success does not have to be me and the first to bear hardships, the last to service spirit to set the partys positive image among the

4、 people is important. Grass-roots party organizations two is to cleanse all people not happy not to see stereotypes, establish the honest faithful, diligent faith for the people. No need to avoid mentioning that, some members of our party can not stand the money, corrosion of temptation, thin, Xu Zh

5、ou, such abuse and corrupt bribery, malfeasance borers, and rats. Two, is to clean up, thin, Xu, Zhous solution to restore the partys fresh and natural, solid and honest work style. Cleansing take, eat, card, undesirable and behaviour, cross, hard and cold, push attitude. Grass-roots party organizat

6、ions two is to strengthen the sense of ordinary party members, participating in consciousness, unity consciousness. For reasons known, members of grass-roots party branches less mobile, less resources, and the construction of party organizations have some lag. Two studies, is to focus on the grass-r

7、oots party branches loose, soft, loose problem, advance the party members and cadres, a gang working, Hong Kong report. Strong cleanup actions, style and rambling, presumptuous unqualified party members, pays special attention to party members and cadres joining party of thought problem. Party build

8、ing is obtained in the long-term development of our partys historical experience accumulated. Two is our party under the new historical conditions, strengthen the partys construction of a new rectification movement. Grass-roots party organizations should always catch the hard work, results-oriented.

9、 Two educational outcomes are long-term oriented and become an important impetus for the work. Two should have three kinds of consciousness two study and education, basic learning lies in the doing. Only the Constitution address the series of party rules, and do solid work, be qualified party member

10、s had a solid ideological basis. Only the learning and do real unity, to form a learn-learn-do-do the virtuous cycle, and ultimately achieve the fundamental objective of education. This requires that the Organization高三数学高职考专题复习 函数问题高考函数问题专题复习高职考考点归纳:1. 映射一般地,设是两个集合,如果按照某种对应法则,对于集合中的任何一个元素,在集合中都有惟一的元

11、素和它对应,这样的对应叫做从集合到集合的映射,记作:。注:理解原象与象及其应用。(1)中每一个元素必有惟一的象;(2)对于中的不同的元素,在中可以有相同的象;(3)允许中元素没有原象。2. 函数(1) 定义:函数是由一个非空数集到时另一个非空数集的映射。(2) 函数的表示方法:列表法、图像法、解析式法。 注:在解函数题时可以画出图像,运用数形结合的方法可以使大部分题目变得更简单。3. 函数的三要素:定义域、值域、对应法则(1) 定义域的求法:使函数(的解析式)有意义的的取值范围主要依据: 分母不能为0 偶次根式的被开方式0 特殊函数定义域(2) 值域的求法:的取值范围 正比例函数: 和 一次函

12、数:的值域为 二次函数:的值域求法:配方法。如果的取值范围不是则还需画图像 反比例函数:的值域为 的值域为 的值域求法:判别式法 另求值域的方法:换元法、反函数法、不等式法、数形结合法、函数的单调性等等。(3) 解析式求法:在求函数解析式时可用换元法、构造法、待定系数法等。4. 函数图像的变换(1) 平移 (2) 翻折 5. 函数的奇偶性(1) 定义域关于原点对称(2) 若奇 若偶注:若奇函数在处有意义,则常值函数()为偶函数既是奇函数又是偶函数6. 函数的单调性对于且,若增函数:值越大,函数值越大;值越小,函数值越小。减函数:值越大,函数值反而越小;值越小,函数值反而越大。复合函数的单调性:

13、与同增或同减时复合函数为增函数;与相异时(一增一减)复合函数为减函数。注:奇偶性和单调性同时出现时可用画图的方法判断。7. 二次函数(1)二次函数的三种解析式一般式:()顶点式: (),其中为顶点两根式: (),其中是的两根(2)图像与性质 二次函数的图像是一条抛物线,有如下特征与性质: 开口 开口向上 开口向下 对称轴: 顶点坐标: 与轴的交点: 一元二次方程根与系数的关系:(韦达定理) 为偶函数的充要条件为 二次函数(二次函数恒大(小)于0) 若二次函数对任意都有,则其对称轴是。 若二次函数的两根. 若两根一正一负则. 若两根同正(同负) .若两根位于内,则利用画图像的办法。 注:若二次函

14、数的两根;位于内,位于内,同样利用画图像的办法。8. 反函数(1)函数有反函数的条件是一一对应的关系(2)求的反函数的一般步骤:确定原函数的值域,也就是反函数的定义域由原函数的解析式,求出将对换得到反函数的解析式,并注明其定义域。(3) 原函数与反函数之间的关系 原函数的定义域是反函数的值域原函数的值域是反函数的定义域 二者的图像关于直线对称 原函数过点,则反函数必过点 原函数与反函数的单调性一致指数函数与对数函数:1. 指数幂的性质与运算(1)根式的性质:为任意正整数,当为奇数时,;当为偶数时,零的任何正整数次方根为零;负数没有偶次方根。(2) 零次幂: (3) 负数指数幂: (4) 分数指

15、数幂: (5) 实数指数幂的运算法则: 2. 幂运算时,注意将小数指数、根式都统一化为分数指数;一般将每个数都化为最小的一个数的次方。3. 幂函数4. 指数与对数的互化 、 5. 对数基本性质: 6. 对数的基本运算: 7. 换底公式: 8. 指数函数、对数函数的图像和性质指数函数对数函数定义 图像 性质(1) (2) 图像经过点(3)(1) (2) 图像经过点(3)9. 利用幂函数、指数函数、对数函数的单调性比较两个数的大小,将其变为同底、同幂(次)或用换底公式或是利用中间值0,1来过渡。10. 指数方程和对数方程(1) 指数式和对数式互化(2) 同底法(3) 换元法(4) 取对数法(5)

16、超越方程(作图法)注:解完方程要记得验证根是否是增根,是否失根。一、函数基础题1、在下列四个函数中,定义域为xxR且x0的函数是 ( )A. B. C. D.2、设,则x= ( )A.3 B.9 C. D.3、函数y=3x与的图象之间的关系是 ( )A.关于原点对称 B.关于x轴对称 C.关于直线y=1对称 D.关于y轴对称4、函数f(x)=xx是 ( )A.偶函数,又是增函数 B.偶函数,又是减函数C.奇函数,又是增函数 D.奇函数,又是减函数5、设函数f(2x)=3(8x2+7),则f(1)= ( )A.2 B.3 39 C. 1 D.3 156、设,则x等于 ( ) A.2 B. C.

17、D.47、函数的定义域是 ( ) A.(0, +) B.(1,+ ) C.0,+) D.1,+ )8、已知函数f(x)=log2(ax+b),f(2)=2,f(3)=3,则 ( ) A.a=1,b= -4 B.a=2,b= -2 C.a=4,b=3 D.a=4,b= -49、函数y=x2+2x 与y=x2-2x的图象 ( ) A.关于x轴对称 B.关于y轴对称 C.关于原点对称 D.关于x轴和y轴都不对称10、已知关于x的方程x2+ax-a=0有两个不等的实根,则 ( )A.a-4或a0 B.a0 C.-4a0 D.a-411、函数y=x2-x和y=x-x2的图象关于 ( )A.坐标原点对称

18、B.x轴对称 C.y轴对称 D.直线y=x对称12、函数 ( )A.是偶函数 B.既是奇函数,又是偶函数C.是奇函数 D.既不是奇函数,也不是偶函数13、关于x的方程x2-(a+3b)x-2b=0的两根之和为8,两根之积为-4,则 ( )A.a=-2,b=-2 B.a=-2,b=2 C.a=2,b=-2 D.a=2,b=214、设x,y为实数,则x2=y2的充分必要条件是 ( )A.x=y B.x=-y C.x3=y3 D.|x|=|y|15、点(2,1)关于直线y=x的对称点的坐标为 ( )A.(-1,2) B.(1,2) C.(-1,-2) D.(1,-2)16、函数 ( )A.是偶函数

19、B.是奇函数C.既是奇函数,又是偶函数 D.既不是奇函数,也不是偶函数17、使函数为增函数的区间是 ( )A.(0,+) B.(-,0) C.(- ,+ ) D.(-1,1)18、设a=log 0. 5 6.7,b=log 24.3,c=log 25.6,则a,b,c的大小关系为 ( )A.bca B.acb C.abc D.cba19、如果指数函数y=-ax的图象过点(3,-),则a的值为 ( )A.2 B.-2 C. D.20、使函数y=log2(2x-x2)为增函数的区间是 ( ) A. 1,+) B.1,2) C.(0,1 D.(-,121、函数 ( )A.是奇函数 B.是偶函数 C.

20、既是奇函数,又是偶函数 D.既不是奇函数,也不是偶函数22、设甲:x3,乙:x5,则 ( )A.甲是乙的充分条件但不是必要条件 B.甲是乙的必要条件但不是充分条件C.甲是乙的充分必要条件 D.甲不是乙的必要条件,也不是乙的充分条件23、点P(3,2)关于y轴的对称点的坐标为 ( )A.(3,-2) B.(-3, 2) C.(0,2) D.(-3,-2)24、设log32=a,则log29等于 ( )A. B. C. D.25、 函数在a,b上单调,则使得必为单调函数的区间是( ) A.a,b+3 B.a+3,b+3 C.a-3,b-3 D.a+3,b 26、已知,则等于 ( )A. B. C.

21、1 D.227、下列函数中为偶函数的是 ( )A.y=cos(x+1) B.y=3x C.y=(x-1)2 D.y=sin2x28、函数的定义域是 ( ) A. B. C. D.33、若函数则 ( ) A. B. C. D.434、偶函数在(,0)上是减函数,那么 ( )A. B. C. D.35、点M(1,1)关于点N(3,2)的对称点M的坐标是 ( ) A.(5,5) B.(4,1) C.(6,4) D.(5,4)36、若函数的图象与的图象关于直线对称,则 ( ) A. B. C. D.37、函数是 ( )A.奇函数且是增函数 B.奇函数且是减函数 C.非奇非偶的增函数 D.非奇非偶的减函

22、数*38、实系数方程有两个相异正实根的充分必要条件是 ( ) A. B. C. D.39、=_.40、函数y=log2(6-5x-x2)的定义域是_ _.41、若,则x=_.42、已知,则x=_.43、函数的定义域是_ _.44、设x1和x2为x2+8x+7=0的两个根,则(x1-x2)2=_ _.45、函数的定义域是_ _.46、设x1和x2为方程x2+ax+b=0 (a0)的两个根,且x12+x22=4,x1x2=,则a等于_ _.47、函数的定义域是_ _.48、已知函数的图象与函数的图象关于直线对称,则 的值等于 .49、函数的最小值等于 .二、二次函数及其应用50、二次函数y=x2+

23、4x+1的最小值是 ( )A.1 B.3 C. 3 D. 451、二次函数y=-x2+4x-6的最大值是 ( ) A.-6 B.-10 C.-2 D.252、设函数f(x)=(m-1)x2+2mx+3是偶函数,则它在 ( )A.区间(-,+)是增函数 B.区间(-,+)是减函数 C.区间0,+)是增函数 D.区间(-,0是增函数53、设函数f(x)=2ax2+(a-1)x+3是偶函数,则a等于 ( ) A.-1 B.0 C.1 D.254、点P(0,1)在函数y=x2+ax+a的图象上,则该函数图象的对称轴方程为 ( )A.x=1 B. C.x=-1 D.55、函数y= -x(x-1) ( )

24、A.有最小值1 B.有最小值-1 C.有最大值 D.有最大值56、函数的最小值为 ( )A. B. C.-3 D.-457、已知二次函数的图象以点(1,3)为顶点,并通过点(2,5),则此二次函数的解析式为y=_.三、函数综合题58、(8分) 计算 59、(8分) 计算 60、(9分)实数m取何值时,关于x的方程x2+(m2)x(m+3)=0的两根的平方和最小?并求出该最小值.61、(8分) 已知二次函数y=ax2+bx+c的图象过点(1,-12),且它的顶点为(-1,-16),求a,b,c的值.62、(9分) 已知二次函数f(x)=ax2+bx+c的图象C与x轴有两个交点,它们之间距离为6,

25、C的对称轴方程为x=2,且f(x)有最小值-9,求 ()a,b ,c的值; ()如果f(x)不大于7,求对应x的取值范围.64、(11分) 假设两个二次函数的图象关于直线x=1对称,其中一个函数的表达式为y=x2+2x-1,求另一个函数的表达式.65、(11分) 已知二次函数y=x2+bx+3的图象与x轴有两个交点,且这两个交点间的距离为2,求b的值.附:参考答案(一)题次123456789101112131415答案DBDCADDDBABCDDB题次161718192021222324252627282930答案BBCDCABBBCDDDDC题次3132333435363738答案BDABA

26、BBD 39. 40. (-6,1) 41. 42.81 43.xx1或x2 44.36 45. 46. 47. -1,+ 48.3 49.9 50-56.BCDCD CB57.y=2x2 -4x+5 58.23 59. 60.当m=1时,最小值为9 61.a=1,b=2,c= -15 62.(1) a=1,b= -4,c= -5 ; (2) -2x6 63. 64.y=x2-6x+7 65.b=4写作不但能培养学生的观察力、联想力、想象力、思考力和记忆力,它的重要性更表现在于学生对字词句的运用、对思想语言和口头语言的提炼、对现实生活知识经验的总结升华、对情感价值观的宣泄。learning e

27、ducation, need three kinds of consciousness: one is to establish an integrated awareness. Learning and do what car isTwo-wheel, bird wings, need to go hand in hand, one end can be neglected. Communist theoretician and man. Only by closely combining theory and practice together in order to truly real

28、ize their value. Learning is the Foundation, the Foundation is not strong, shaking; Is the key to net to net thousands of accounts. Two education, lay the basis, going to do the key grip, so that the learning and doing back to standard, so that the majority of party members learn learning theory of

29、nutrients, in the doing practice partys purposes. Second, to establish a sense of depth. Learning and do not Chu drawn, entirely different, but the organic unity of the whole. Two learning education, we need to explore integrating learning in do, exhibit do in Science. To avoid the learning into sim

30、ple room instruction, do into a monotone for doing. Should exploration learn in the has do, do in the has learn of education and practice of carrier, makes general grass-roots members can in learn in the has do of achievements sense, in do in the has learn of get sense, real makes party of theory br

31、ain into heart, put for people service concept outside of Yu shaped. Third, to adhere to long-term the awareness. Style construction on the road forever, two had to catch the long-term. Two study and education, by no means, assault-style wind-sport, but the recurrent education within the party. In r

32、ecent years, the partys mass line education practice and three-three special education in grass-roots borne rich fruits, vast numbers of party members and cadres withstood the baptism of the spirit. Two greater need to focus on longer hold long-term, to establish and perfect the effective mechanism

33、of the education, focusing on the creation of long-term education, strive to make the vast number of party members to maintain their vanguard Color, maintain the partys advanced nature and purity. Awareness-raising, antennas and atmosphere a discussion on how leading cadres of party members two curr

34、ent, two activity is in full swing up and down the country, party cadres as a key minority is both a barometer and impetus. The two meaning enough deep, is to determine the party cadres can resolve to study hard first. In the two in the process, some cadres of himself, standing long, high awareness,

35、 that Constitution Party rules is simple, its not worth bothering some party cadres think speak series has nothing to do with the grass-roots work, water business learning series of speeches seen as window dressing. These lazy, casual, and decadent ideas learning lacks motivation, a serious impediment to two effect. John Stuart Mill once said, only a basic element of human thought patterns change dramatically, human destiny can make great improvement. The same, only party members and13

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