5.23×2.7+47.7×0.27=5.23×2.7+4.77×2.7=2.7×(5.23+4.77)=2.7×10=27
可以变成5.23*2.7+4.77*10*0.27，变成5.23*2.7+4.77*2.7=（5.23+4.77）*2.7=27
5.23x2.7+47.7x0.27=52.3x0.27+47.7x0.27=（52.3+47.7）x0.27=100x0.27=27
