4.78×2.34+48.7×0.266=4.78x2.34+4.87x2.66,无法简便计算,可能是题目错了以下可简便计算:4.78×2.34+47.8×0.266=4.78x2.34+4.78x2.66=4.78x(2.34+2.66)=4.78x5=23.9或4.87×2.34+48.7×0.266=4.87x2.34+4.87x2.66=4.87x(2.34+2.66)=4.87x5=24.35