先把0.48分成0.24x2∴原式=(0.24x2X56)+88x0.24=(0.24x112)+88X0.24再把0.24提出来，即0.24(112+88)=0.24X200=48
0.48*56+88*0.24=(0.48/2)*(56*2)+88*0.24=0.24*112+88*0.24=0.24*(112+88)=0.24*200=48
