整数指数幂市名师优质课比赛一等奖市公开课获奖课件.pptx

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level,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title styleClick to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,第十五章 分 式,15.2.3,整数指数幂（,2,）,第1页,【,学习目标,】,1,、使学生深入掌握负指数幂意义。,2,、使学生熟练利用（,a0n,是正整数）将较小数写成科学计数法形式。,3,、经过探索，让学生体会到从特殊到普通方法是研究数学一个主要方法。,【,学习重、难点,】,重点：能灵活利用整数指数幂运算性质计算，以及用科学记数法表示一些绝对值较小数,.,难点：了解和应用整数指数幂性质。,第2页,【,预习导学,】,一、自学指导,1,、自学,1,：,自学书本,P145,页,“,思索与例,10,”,，掌握用科学记数法表示一些绝对值较小数，并能灵活利用整数指数幂运算性质计算，完成填空。,5,分钟,；,；,；,；,.,总结归纳：,把一个数表示成,形式（其中 ，,n,是,整数）记数方法叫做科学记数法,用科学记数法表示绝对值大于,10,n,位整数时，其中,10,指数是,，即原数整数位数减一，,a,取值范围是,。,用科学记数法表示绝对值小于,1,小数时,即将它们表示成,形式，其中,10,指数是,指数绝对值等于原数中左起第一个非,0,数字前面,0,个数,(,包含小数点前面一个,0),0.01,0.001,0.0001,正整数,1a,10,负正数，,1a,10,第3页,【,预习导学,】,二、自学检测：,学生自主完成，小组内展示、点评，教师巡视。,10,分钟,1,、教材,P145-146,练习题,1,、,2,两题；,2,、把以下科学记数法还原：,解：,3,、用科学记数法表示以下各数,并保留,3,个有效数字。,解：,4,、写出原来数，并指出准确到哪一位？,解：,-0.015,0.01,，准确到了百分位；,0.000070015,0.00007001,，准确到了亿分位。,第4页,【,合作探究,】,小组讨论交流解题思绪，小组活动后，小组代表展示活动结果。,10,分钟,探究,1,计算：（结果用科学记数法表示）,解：,第5页,【,合作探究,】,小组讨论交流解题思绪，小组活动后，小组代表展示活动结果。,10,分钟,探究,2,纳米是一个长度单位，,1,纳米,=10,9,米，一个纳米粒子直径是,35,纳米，它等于多少米？请用科学记数法表示,.,解：,1,纳米 米,35,纳米,3510-9,米,.,而,3510,-9,（,3.510,）,10,-9,3510,1,（,9,）,3.510,-8,，,这个纳米粒子直径为,3.510,-8,米,.,点拨精讲：,纳米是长度单位。,第6页,【,跟踪练习,】,学生独立确定解题思绪，小组内交流，上台展示并讲解思绪。,5,分钟,1,、计算,(1)(310,-8,)(410,3,)(2)(210,-3,),2,(10,-3,),3,2,、一枚一角硬币直径约为,0.022m,，用科学记数法表示为（）,A,、,B,、,C,、,D,、,3,、在电子显微镜下测得一个圆球体细胞直径是,个这么,细胞排成细胞链长是（）,A,、,B,、,C,、,D,、,4,、纳米是一个长度单位，,1,纳米,=10,9,米。已知某花粉直径为,3500,纳米，那么用科学记数法表示这种花粉直径为,米。,5,、用科学计数法表示以下各数,（,1,）,0.000000314,.,（,2,）,0.00017,.,（,3,）,0.000000001,.,（,4,）,-0.000009001,.,B,B,第7页,【,点拨精讲,】,（,3,分钟）,引进了零指数幂和负整数幂，指数范围扩大到了全体整数，幂性质依然成立。科学记数法不但能够表示一个绝对值大于,10,数，也能够表示一些绝对值较小数，在应用中，要注意,a,必须满足，,1,a,10,。,第8页,【,课堂小结,】,（学生总结本堂课收获与迷惑）,2,分钟,【,当堂训练,】,10,分钟,第9页,