=1.2-0.5*【-(-25-100)的开立方)+【(-125/64)开立方】=1.2-0.5*[5+(-5/4)]=1.2-0.5*15/4=-0.675
原式=1.2-0.5×[-³√(-125)+³√(-125/64)] =1.2-0.5×(5-5/4) =1.2-0.5×3.75 =1.2-1.875 =0.675