вычислите 3/5:(9/16-3/5*8/9)

3/5:(9/16-3/5*8/9)=3/5:(9/16-1/5*8/3)=3/5:(9/16-8/15)=3/5:(135/240-128/240)=3/5:7/240=3/5*240/7=3*48/7=144/7 или 20 4/7