简便计算是直接提取公约数0.54得原式=0.54x(75+26-1) =0.54x100 =54加油哦
计算如下 :5.4×7.5+5.4×2.6-0.54=5.4×7.5+5.4×2.6-5.4×0.1=5.4×(7.5+2.6-0.1)=5.4×10=54