分数的基本性质 (5).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,*,分数的基本性质,1,2,2,4,=,1,2,2,4,=,4,8,1,2,=,1,2,8,16,=,1,2,2,4,4,8,8,16,=,=,=,1,2,1(),2(),2,4,=,=,1,2,1(),2(),4,8,=,=,1,2,1(),2(),8,16,=,=,2,2,4,4,8,8,2,4,2(),4(),1,2,=,=,4,8,4(),8(),1,2,=,=,8,16,8(),16(),1,2,=,=,2,2,4,4,8,8,分数的分子和分母,同时,乘,或除以,相同,的数,(0,除外,),，,分数的大小不变。,这就是,分数的基本性质,。,2,3,4,6,22,32,=,=,12,16,3,4,124,164,=,=,判断下面每组的两个分数,是否相等,并说明理由,.,5,6,5,15,1,5,25,30,18,24,2,3,3,4,9,12,和,和,和,和,5,15,1,5,和,18,24,2,3,和,5,6,25,30,和,3,4,9,12,和,5,6,25,30,和,5,6,=,55,65,=,25,30,5,6,25,30,=,5,15,1,5,和,5,15,=,55,155,=,1,3,5,15,1,5,不等于,