课题三-正比例和反比例的意义(A案).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,*,第,三,单元,比 例,课题,三 正比例和反比例的意义,（,A,案）,北京市朝阳区王四营中心小学 刘 晶,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,长（厘米）,面积（平方厘米）,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,长（厘米）,面积（平方厘米）,3,6,12,6,24,24,12,48,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,自学提示：,（,1,）把表中数据填写完整。,（,2,）表中变化的量是什么？而不变的量是什么？表中的量变化的规律是什么？,（,3,）请你用关系式来表示出它们的变化规律。,宽（厘米）,24,12,6,长（厘米）,1,2,3,长,宽,=,面积（一定）,速度（千米,/,时）,5,10,40,时间（时）,4,1,0.5,速度,时间,=,路程（一定）,出勤人数（人）,29,27,25,20,缺勤人数（人）,1,3,8,10,出勤人数,+,缺勤人数,=,总人数（一定）,8,4,22,5,2,20,数量（米）,1,4,8,总价（元）,4,8,16,32,小明（岁）,5,7,8,父亲（岁）,30,31,33,父亲年龄,-,小明年龄,=,年龄差（一定）,2,32,6,=,单价（不变）,总价,数量,正方形的边长和面积的变化情况表：,（,1,）认真观察，边长和面积这两种量有什么关系？,（,2,）你们认为它们是什么比例关系？,边长（米）,1,2,3,4,面积（平方米）,1,4,9,16,