We had a heated discussion in a relaxed ____(气氛)yesterday.
①设法稳住歹徒 ②记住歹徒相貌 ③了解歹徒去向 ④及时拨打110报警电话 ⑤息事宁人,悄悄走看
12-3=____
13-5=____
16-8=____
0+7=____
5+5=____