(-1/42)÷(1/6+2/3-3/143-2/7)=(-1/42)÷(5/6-3/14-2/7)=(-1/42)÷[5/6-(3/14+2/7)=(-1/42)÷[5/6-1/2]=(-1/42)÷1/3=(-1/42)×3=-1/14
(-1/42)除以(1/6-3/14+2/3-2/7)=-1÷(1/6×42-3/14×42+2/3×42-2/7×42)=-1÷(7-9+28-12)=-1/14
负的十四分之一