1、一年级一年级数学数学下册下册 20 以内口算练习以内口算练习 9+6= 13-7= 6+8= 12-7= 16-8= 4+9= 16-9= 16-4= 11-5= 11-2= 13-4= 5+6= 12-3= 5+9= 14-7= 13-5= 14-6= 15-9= 9+5= 6+6= 7+4= 7+7= 15-9= 13-6= 13-4= 12-8= 11-3= 14-9= 9+8= 8+8= 5+8= 11-6= 8+3= 13-5= 5+7= 15-7= 19-9= 8+9= 12-3= 8+8= 16-9= 13-8= 18-8= 6+7= 11-2= 13-4= 15-8= 18-9
2、= 10+6= 8+7= 9+8= 16-8= 13-7= 14-8= 16-7= 17-9= 17-5= 13-3= 14-5= 11-7= 14-5+6= 5+5+8= 9+8= 11-9= 6+8-9= 18-9+6= 13-6+8= 15-8= 17-8= 5+7-5= 12-7+6= 2+8+5= 7+8= 14-8= 4+8-5= 15-7+6= 6+8-7= 8-7= 16-9= 9+5-5= 6+8-9= 11-3+6= 13-8= 1+9= 11-3+5= 3+6+8= 4+8-3= 11-3= 13-7= 15-8+6= 16-7+4= 9-9+8= 6+8= 13-9= 3+7+6= 15-7+6= 12-5+6= 3+9= 16-7= 3+9-8= 5+7-9= 8+8-9= 15-7= 4+8= 5+7-4= 6+4+5= 4+6+8= 13-9= 5+6= 6+9-8=
