+15与+7,-11,+3,+12,+5,-8,-14怎么计算
问题描述:
+15与+7,-11,+3,+12,+5,-8,-14怎么计算
答
15+7-11+3+12+5-8-14
=(15+5+7+3+12)-(14+8)-11
=42-22-11
=20-11
=9