划分4个子网，每个子网32个地址，①180.224.74.0~180.224.74.31；②180.224.74.32~180.224.74.63；③180.224.74.64~180.224.74.95；④180.224.74.96~180.224.74.127每个子网的第1个是网络地址，最后1个是广播地址请采纳，谢谢
