11-911-8 11-7 11-6 11-4 11-2 12-9 12-8 12-6 12-5 12-3 13-8 13-7 13-5 13-4 14-9 14-7 14-6 14-5 15-9 15-8 15-7 15-6 16-9 16-8 17-8 18-9 找规律填出所缺的算式 11-5 17-9 14-9 12-7 16-7 13-6 13-9 11-3 12-4 横着看第一行都是11减几 11减几 12减几 13减几 14减几 15减几 16减几 17减几 18减几 竖着看