分式方程PPT市名师优质课比赛一等奖市公开课获奖课件.pptx

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,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,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,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth 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,15.3,分式方程（,3,）,第1页,【,学习目标,】,1,、深入熟练地解可化为一元一次方程分式方程。,2,、经过分式方程实际应用，培养学生数学应用意识。,【,学习重、难点,】,重点：让学生学习审明题意设未知数，列分式方程。,难点：在不一样实际问题中，设元列分式方程。,第2页,【,预习导学,】,一、自学指导,1,、自学,1,：,自学书本,P152,153,页,“,例,3,、例,4,”,，掌握用分式方程解答实际问题方法，完成填空。,5,分钟,列方程解应用题普通步骤？,某校招生录用时，为了预防数据输入犯错，,2640,名学生成绩数据分别由两位程序操作员各向计算机输入一遍，然后让计算机比较两人输入是否一致,.,已知甲输入速度是乙,2,倍，结果甲比乙少用,2,小时输完,.,问这两个操作员每分钟各能输入多少名学生成绩？,解：设乙每分钟能输入,x,名学生成绩，则甲每分能输入,2x,名学生成绩，依据题意得,解得,x,11.,经检验，,x,11,是原方程解,.x,11,，,2x,211,22,，符合题意,.,答：甲每分输入,22,名学生成绩，乙每分输入,11,名学生成绩,.,点拨精讲：,既要检验所求解是否是原分式方程解，还要检验是否符合题意。,第3页,【,预习导学,】,总结归纳：,列分式方程解应用题普通步骤,（,1,）,；,（,2,）,（要有单位）；（,3,）依据题目中,列出式子，找出,，列出方程；（,4,）,，还要看方程解,；（,5,）,（要有单位）。,x,点拨精讲：,从例,4,能够看出字母不但能够表示未知数，也能够表示有实,际意义已知数。,审清题意,设未知数,数量关系,相等关系,解方程，并验根,是否符合题意,写出答案,第4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,P154,页练习题第,1,、,2,题；,2,、甲乙两人同时从,A,地出发，骑自行车到,B,地，已知,AB,两地距离为,30km,，甲每小时比乙多走,3km,，而且比乙先到,40,分钟设乙每小时走,xkm,，则可列方程为（）,A,、,B,、,C,、,D,、,3,、我军某部由驻地到距离,30,千米地方去执行任务，因情况发生了改变，急行军速度必需是原计划,1.5,倍，才能按要求提前,2,小时抵达，求急行军速度。,B,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,1,A,，,B,两地相距,135,千米，两辆汽车从,A,开往,B,，大汽车比小汽车早出发,5,小时，小汽车比大汽车晚到,30,分钟，已知小汽车与大汽车速度之比为,5,：,2,，求两车速度。,解：设大车速度为,2x,千米,/,时，小车速度为,5x,千米,/,时，依据题意得,两边同时乘以,10 x,，得,675-270=45x,解之得,x=9,检验：当,x=9,时，,10 x0,，所以,x=9,是原方程解,当,x=9,时，,2x=18,，,5x=45,答：大车速度为,18,千米,/,时，小车速度为,45,千米,/,时,.,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,2,轮船在顺水中航行,20,千米与逆水中航行,10,千米所用时间相同，水流速度为,2.5,千米,/,小时，求轮船静水速度,.,解：设轮船静水速度为,x,千米,/,小时，则有,两边同时乘以,x+2.5,，得,20(x-2.5)=10(x+2.5),解之，得,x=7.5,检验：当,x=7.5,时，,x+2.50,，所以,x=7.5,是原方程解。,答：轮船静水速度为,7.5,千米,/,小时,.,点拨精讲：,顺水速度,=,船静水速度,+,水速；逆水速度,=,船静水速度,-,水速,.,第7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,、甲做,360,个零件与乙做,480,个零件所用时间相同，已知两人天天共做,140,个零件，若设甲天天做,x,个零件，列方程得,(),A,、,B,、,C,、,D,、,2,、在课外活动跳绳时，相同时间内小林跳了,90,下，小群跳了,120,下已,知小群每分钟比小林多跳,20,下，设小林每分钟跳,x,下，则依据题意可列关于,x,方程为,3,、某市为治理污水，需要铺设一段全长为,300 m,污水排放管道铺设,120 m,后，为了尽可能降低施工对城市交通所造成影响，以后天天工效比原计划增加,20%,，结果共用,30,天完成这一任务求原计划天天铺设管道长度假如设原计划天天铺设,xm,管道，那么依据题意，可得方程,.,A,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,4,、近几年高速公路建设有较大发展，有力地促进了经济建设欲修建某高速公路要招标现有甲,.,乙两个工程队，若甲,.,乙两队合作，,24,天能够完成，费用为,120,万元；若甲单独做,20,天后剩下工程由乙做，还需,40,天才能完成，这么所需费用,110,万元，问：,(1),甲,.,乙两队单独完成此项工程，各需多少天？,(2),甲,.,乙两队单独完成此项工程，各需多少万元？,第9页,【,点拨精讲,】,（,3,分钟）,列分式方程解应用题普通步骤：,（,1,）审清题意；,（,2,）设未知数（要有单位）；,（,3,）依据题目中数量关系列出式子，找出相等关系，列出方程；,（,4,）解方程，并验根，还要看方程解是否符合题意；,（,5,）写出答案（要有单位）。,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,