教育课件分式的基本性质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 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,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,15.1.,分式基本性质,第1页,【,学习目标,】,1,、掌握分式基本性质，掌握分式约分方法，熟练进行约分，并了解最简分式意义。,2,、使学生了解分式通分意义，掌握分式通分方法及步骤；,【,学习重、难点,】,重点：知道约分、通分依据和作用，掌握分式约分、通分方法。,难点：掌握分式约分、通分方法，了解分式变号法则。,第2页,【,预习导学,】,一、自学指导,1,、自学,1,：,自学书本,P129-130,页思索与例,2,，掌握分式基本性质，完成填空。,3,分钟,总结归纳：,分式分子与分母,整式，分式值不变用式子表示为：,。,乘（或除以同一个不等于,0,）,第3页,【,预习导学,】,2,、自学,2,：,自学教材,P130,131,页思索与例,3,，掌握分式约分方法，能准确找出分子、分母公因式，了解最简分式概念。,3,分钟,总结归纳：,依据分式基本性质，把一个分式分子、分母,约去，叫做约分。,分式，叫做最简分式。分式约分，普通要约去分子与分母全部公因式，使所得结果成为,。,公因式,分子与分母没有公因式,最简分式或者整式,第4页,【,预习导学,】,3,、自学,3,：,自学教材,P131,132,页思索与例,4,，掌握分式通分方法，学会找最简公分母。,3,分钟,总结归纳：,依据分式基本性质，,.,叫做分式通分。普通,.,它叫做最简公分母。,找最简公分母方法：,1,、若分母是多项式,；,2,、取各分式分母中系数,；,3,、各分式分母中,.,都要取到；,4,、相同字母（或因式）幂取,。,把几个异分母分式分别化成与原来,分式,相等同分母分式,取各分母全部因式最高次幂,积作公分母,先分解因式,最小公倍数,全部字母或因式,指数最大,第5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。,8,分钟,1,、以下等式左边是怎样从左边得到？,2,、教材,P132,页练习题第,1,、,2,两题。,第6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,不改变分式值，把以下各式分子与分母各项系数都化为整数。,第7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,不改变分式值，使下面分式分子、分母都不含,“,”,号。,点拨精讲：,分式分子、分母以及分式本身三个符号，改变其中任何两个符号，分式值不变。,第8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,、教材,P133,页,4,、,6,、,7,题。,2,、教材,P134,页,12,题。,第9页,【,点拨精讲,】,（,3,分钟）,1,、分式约分：分子、分母都是多项式先分解因式，便于找公因式，分式化简结果一定要是最简分式。且普通分子、分母中不含,“,”,；,2,、分式通分关键是找准最简公分母，若分母是多项式先分解因式，便于找最简公分母。,第10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11页,