-1/8÷(-1/8+1/4-1/2)=-1/8÷(1/8-1/2)=-1/8÷(-3/8)=1/3-1/8÷(-1/8+1/4-1/2)=-1/8÷(-1/8-1/4)=-1/8÷(-3/8)=1/3-1/8÷(-1/8+1/4-1/2)=-1/8÷(-1/8)-1/8÷1/4+1/8÷1/2=1/3