Помогите пожалуйста,номер 291
30/3=10 1/3=1*10/(3*10)=10/30 2/3=2*10/(3*10)=20/30 30/5=6 1/5=1*6/(5*6)=6/30 2/5=2*6/(5*6)=12/30 4/5=4*6/(5*6)=24/30 30/6=5 1/6=1*5/(6*5)=5/30 5/6=5*5/(5*6)=25/30 30/10=3 3/10=3*3/(10*3)=9/30 7/10=7*3/(10*3)=31/30 9/10=9*3/(10*3)=27/30