写错了,是绝对值小于6.4的整数吧
应该是-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6
其中非负整数有0,1,2,3,4,5,6
相反数大于-3且小于5的整数有-4,-3,-2,-1,0,1,2