13.75-（-21.8）+（-24.76）-3.2+26 =13.75+21.8-24.76-3.2+26 =25.55-24.76-3.2+26 =0.79-3.2+26 =-2.41+26 =23.59
13.76减（负21.8）加（负24.76）减3.2加26等于多少（脱式计算）
13.75-（-21.8）+（-24.76）-3.2+26 =13.75+21.8-24.76-3.2+26 =25.55-24.76-3.2+26 =0.79-3.2+26 =-2.41+26 =23.59