脱式计算=7/6×(-8/3-3/8)=7/6×(-64/24-9/24)=7/6×(-73/24)=-511/144
7/6x(-8/3)+(-7/6)x(3/8)=(-7/6)x(8/3+3/8)=(-7/6)x73/24=-511/144
7/6*(-8/3)+(-7/6)*(+3/8)=7/6*(-8/3)+7/6*(-3/8)=7/6*(-8/3-3/8)=7/6*(-64/24-9/24)=7/6*(-73/24)=-501/24。