5.6*8+4.5/0.25=5.6*8+4.5/(1/4)=5.6*8+4.5*4=44.8+18=62.87.5*【63.9/（7-2.5）】=7.5*【63.9/（4.5）】=7.5*【0.9*71/（0.9*5）】=7.5*【71/5】=15/2*71/5=3/2*71=1.5*71=106.55.5*8+4.5/0.125=5.5*8+4.5/(1/8)=5....