《正比例》课件.ppt

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,*,正比例,一辆汽车按同样的速度行驶，行驶的时间和路程如下：,老师有,10,本书，借出的本数与剩余的本数：,时间,/,时,1,2,3,4,5,路程,/,千米,90,180,270,360,450,s,与,t,的比值,(,一定,),90,90,90,90,90,借出的本数,1,2,3,4,5,剩余的本数,9,8,7,6,5,借与剩的和（,一定,）,10,10,10,10,10,=v(,一定,),借,+,剩,=,总本数（,一定,）,时间,/,时,1,2,3,4,5,路程,/,千米,90,180,270,360,450,S,与,V,比值,(,一定,),90,90,90,90,90,正方形边长,/cm,正方形周长,/cm,正方形边长,/cm,正方形面积,/cm,2,借,+,剩,=,总本数（,一定,）,=v(,一定,),借出的本数,1,2,3,4,5,剩余的本数,9,8,7,6,5,借与剩的和,(,一定,),10,10,10,10,10,时间,/,时,1,2,3,4,5,路程,/,千米,90,180,270,360,450,S,与,t,比值,(,一定,),90,90,90,90,90,借出的本数,1,2,3,4,5,剩余的本数,9,8,7,6,5,借与剩的和,(,一定,),10,10,10,10,10,1,2,3,4,5,90,180,270,360,450,S,与,t,比值,(,一定,),90,90,90,90,90,1,2,3,4,4,8,12,16,c,与,a,比值,(,一定,),4,4,4,4,正方形边长,/cm,1,2,3,4,正方形面积,/cm,2,1,4,9,16,s,与,a,比值,(,不一定,),1,2,3,4,借,+,剩,=,总本数（,一定,）,=v(,一定,),=4(,一定,),=a(,不一定,),时间,/,时,正方形边长,/cm,路程,/,千米,正方形周长,/cm,借出的本数,1,2,3,4,5,剩余的本数,9,8,7,6,5,借与剩的和,(,一定,),10,10,10,10,10,/,千米,1,2,3,4,5,/,时,90,180,270,360,450,S,与,t,比值,(,一定,),90,90,90,90,90,/cm,1,2,3,4,/cm,4,8,12,16,c,与,a,比值,(,一定,),4,4,4,4,正方形边长,/cm,1,2,3,4,正方形面积,/cm,2,1,4,9,16,s,与,a,比值,(,不一定,),1,2,3,4,借,+,剩,=,总本数（,一定,）,=v(,一定,),=4(,一定,),=a(,不一定,),时间,正方形边长,路程,正方形周长,两种相关联的量，一种量变化，另一种量也随着变化，并且这两种量中相对应的两个数的,比值,（也就是商）,一定,。像这样的两种量我们就把它们叫做成正比例的量，它们的关系叫做正比例关系。,yx=k,质量,/,千克,10,9,8,7,6,5,应付钱数,/,元,20,18,16,14,12,10,一些人买同一种苹果，购买苹果的质量和应付钱数如下。,应付钱数,_,质量,=,单价（,一定,）,借出的本数,1,2,3,4,5,剩余的本数,9,8,7,6,5,借与剩的和,(,一定,),10,10,10,10,10,时间,/,时,1,2,3,4,5,路程,/,千米,90,180,270,360,450,S,与,t,比值,(,一定,),90,90,90,90,90,正方形边长,/cm,1,2,3,4,正方形周长,/cm,4,8,12,16,c,与,a,比值,(,一定,),4,4,4,4,正方形边长,/cm,1,2,3,4,正方形面积,/cm,2,1,4,9,16,s,与,a,比值,(,不一定,),1,2,3,4,借,+,剩,=,总本数（,一定,）,=v(,一定,),=4(,一定,),=a(,不一定,),时间,/,时,1,2,3,4,5,路程,/,千米,90,180,270,360,450,S,与,t,比值,(,一定,),90,90,90,90,90,正方形边长,/cm,1,2,3,4,正方形周长,/cm,4,8,12,16,c,与,a,比值,(,一定,),4,4,4,4,=v(,一定,),=4(,一定,),全课小结,谈谈这节课的收获！,