2009年秋《中国通史》(1)(2)教学大纲.doc
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1、在家里了,停下来想了一会还是返回家取了作业本再上学;(2) 我骑着车一路匀速行驶,只是在途中遇到一次交通堵塞,耽搁了一些时间;(3) 我出发后,心情轻松,缓缓行进,后来为了赶时间加快了速度。课堂练习1下列四个图像中,是函数图像的是 ( )(1)(2)(3)(4)A、(1) B、(1)、(3)、(4) C、(1)、(2)、(3) D、(3)、(4)2直线和函数的图象的交点个数 ( )A 至多一个 B 至少有一个 C 有且仅有一个 D 有一个或两个以上3函数y=|x+1|+1的图象是 ( )4某企业近几年的年产值如图,则年增长率最高的是( )(年增长率=年增长值/年产值)A)97年B)98年C)9
2、9年D)00年5作出函数或)的图象;归纳反思 根据函数的解析式画函数的图象,基本方法是描点法,但值得指出的是:一要注意函数的定义域,二要注意对函数解析式的特征加以分析,充分利用已知函数的图象提高作图的速度和准确性; 函数的图象是表示函数的一种方法,通过函数的图象可以直观地表示与的对应关系以及两个变量变化过程中的变化趋势,以后我们会经常地运用函数解析式与函数图象两者的有机结合来研究函数的性质巩固提高1某学生离家去学校,由于怕迟到,所以一开始就跑步,等跑累了再走作余下的路,在下图中纵轴表示离学校距离,横轴表示出发后的时间,则下图中较符合学生走法的是 ( )d d d dO t O t O t O
3、tA B C D2某工厂八年来产品C(即前t年年产量之和)与时间t(年)的函数如下图,下列四种说法:(1)前三年中,产量增长的速度越来越快; (2)前三年中,产量增长的速度越来越慢; (3)第三年后,年产量保持不变; (4)第三年后,年产量逐步增长 其中说法正确的是 ( ) A(2)与(3)B(2)与(4)C(1)与(3)D(1)与(4)3.下列各图象中,哪一个不可能是函数的图象 ( )00 A B 00 C D4.函数的图象不通过第一象限,则满足- A B C Dyyyy5.函数与(的图象只可能是- x000xxx0 A B C D yyyy6.函数的图象是- 0x0x0xx0A B C D
4、 7.函数2)的图象是 8.一次函数的图象经过点(2,0)和(-2,1),则此函数的解析式为 9.若二次函数的图象的对称轴为,则 10.在同一个坐标系中作出函数=与=的图象(1)问:的图象关于什么直线对称?(2)已知,比较大小: 2.1.2 函数的表示方法自学目标1.了解表示函数有三种基本方法:图象法、列表法、解析法;理解函数关系的三种表示方法具有内在的联系,在一定的条件下是可以互相转化的.2.了解求函数解析式的一些基本方法,会求一些简单函数的解析式.3.了解简单的分段函数的特点以及应用.知识要点1.表示函数的方法,常用的有:解析法,列表法和图象法.在表示函数的基本方法中,列表法就是直接列表表
5、示函数,图象法就是直接作图表示函数,而解析法是通过函数解析式表示函数.2.求函数的解析式,一般有三种情况根据实际问题建立函数的关系式;已知函数的类型求函数的解析式;运用换元法求函数的解析式;3分段函数在定义域内不同部分上,有不同的解析表达式的函数通常叫做分段函数;注意:分段函数是一个函数,而不是几个函数;分段函数的定义域是的不同取值范围的并集;其值域是相应的的取值范围的并集例题分析例1 购买某种饮料x听,所需钱数为y元若每听2元,试分别用解析法、列表法、图象法将y表示x()成的函数,并指出该函数的值域例2(1)已知f(x)是一次函数,且f(f(x)=4x-1,求f(x)的表达式;(2)已知f(
6、2x-3)= +x+1,求f(x)的表达式;例3画出函数的图象,并求,变题 作出函数 的图象变题 作出函数f(x)=x+1+x-2的图象变题 求函数f(x)=x+1+x-2的值域变题 作出函数f(x)=x+1+x-2的图象,是否存在使得f()=?通过分类讨论,将解析式化为不含有绝对值的式子作出f(x)的图象 由图可知,的值域为,而,故不存在,使例4已知函数(1)求f(-3)、ff(3) ;(2)若f(a)= ,求a的值 课堂练习1用长为30cm的铁丝围成矩形,试将矩ed d. appointed41. When reading the newspaper in the evening, I o
7、ften fall _C_.a. slept b. sleep c. asleep d. sleeping42. The illness was not brought about by natural _C_.a. sources b. reasons c. causes d. originsII. 阅读下面的短文,从短文后所给的,四个选项中选出能填入相应空白处的最佳选项。A. After a couple of minutes a man sat down opposite me. There was nothing 1 _ about him, except that he was ve
8、ry tall. In fact he looked like a 2 city business- man, wearing a dark suit and carrying a briefcase. I did not say anything to the man and just carried on with my reading. Suddenly he .3 the table, opened my packet of biscuits, took one, dipped it into his coffee and put it into his mouth. I was to
9、o 4_ to say anything. Anyway, I decided to pay no attention to it. I always avoid_ 5 if I can. I just took a biscuit myself and went back to my reading.When the man took a second biscuit. I did not look up and made no sound. I _6_ to be very interested in my reading. After a couple of minutes, I cas
10、ually put out my hand, took the last biscuit and 7 at file man. He was staring at me 8 . I was ready to get up and leave when the man suddenly pushed back his chair, stood up and hurried out of the coffee bar. I felt happy that the man had left and I decided to wait two or three minutes before going
11、 myself. I finished my coffee, 9 my newspaper mid stood up. To my 10 , I found on the table, where my newspaper had been, was my packet of biscuits.D 1. A. additional B. pleasant C. important D. specialD 2. A. confused B. curious C. dusty D. typicalA 3. A. reached B. remained C. passed D. calledA 4.
12、 A. shocked B. careless C. content D. determinedB 5. A. adventure B. trouble C. accident D. contactB 6. A. prepared B. pretended C. preserved D. presentedC 7. A. spoke B. exclaimed C. glanced D. studiedC 8. A. swiftly B. loudly C. angrily D. bravelyD 9. A. threw B. tore C. found D. foldedA 10. A. su
13、rprise B. disappointment C. satisfaction D. fearB. Ian and Shiree are a very unusual couple. Although they (1)_ in the heart of London, they try to grow as much of their own food as possible. At the moment they (2)_an allotment from the local council to grow food on, but they plan(3)_more land soon.
14、 We (4) _growing our own food five years ago, said Ian, since then we (5) _about half of the vegetables we need and a quarter of the fruit. We (6)_on the allotment for three years. We (7)_our own garden before that. They do not plan to stop there though, By this time next year we (8)_enough land to
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