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,*,十加几和相应的减法,4,4,4,4,3,3,3,3,7,7,7,7,15,10+5=,1,个十,5,个一,和,合起来,15,10+5=,15,5+10=,5,个一,1,个十,合起来,和,15,10+5=,15,5+10=,15 10=,15,里面有,1,个十,和,5,个一,5,5,15,10+5=,15,5+10=,15 10=,15,里面有,5,个一,和,1,个十,15 5 =,10,10,10,10,10,+,+,7,7,7,7,17,17,17,17,?个,10,+,4,14,13,3,10,14,10,10,+,3,13,13,