Question 403212
{{{1/2+(2/3 )/ (3/4)-(4/5 )* (5/6)=1/2+(2/3) * (4/3)-(4*5)/(5*6)=1/2+(2*4)/(3*3)-4/6=1/2+8/9-2/3=(1*9)/18+(8*2)/18-(2*6)/18=(9+16-12)/18=13/18}}}