5÷0.125=5×8÷（0,125×8）=40÷1=400.125×32×25%=0.125×8×（4×25%）=1×1=136×（1/3+1/6+1/4+1/9）=36×1/3+36×1/6+36×1/4+36×1/9=12+6+9+4=3111/9×3.8-3.8×2/9=3.8×（11/9-2/9）=3.8