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,*,0,*,0,的认识,*,0,表示没有。,0,表示起点,。,*,排一排,*,1,2,3,4,5,0,*,你能把它们按从大到小排一排吗,?,*,*,0,的加,、,减法,*,3,-,3,=,0,4,-,4,=,0,5,-,5,=,0,*,0,的加,、,减法,*,0,4,=,4,+,4,0,=,4,+,5-,0,=,*,0,的加,、,减法,*,想一想：,5+,0,=,5,0,+5=,5,0,+0=,0,0-,0=,0,？,5,*,0,的加、减法,*,*,我能用手指做,0,的加、减法,*,*,我看图写算式,*,5-,1,=,4,5-,2,=,3,5-,3,=,2,5-,4,=,1,5-,0,=,5,5-,5,=,0,红花,配,绿叶,