m:4/7=3 m=3*4/7 m=3/1*4/7 m=12/7=1 5/7 а:2=5/6 а=5/6*2 а=5/6*2/1 а=5/3*1/1 а=5/3=1 2/3 n:5/9=4 n=4*5/9 n=4/1*5/9 n=20/9=2 2/9 b:2=3/4 b=3/4*2 b=3/4*2/1 b=3/2*1/1 b=3/2=1 1/2