Ответ:
6 2/3:2 7/9=20/3•9/25=180/75=36/15=2 6/15
5 1/3:3 5/9=16/3:32/9= 16/3•9/32=144/96=12/8=3/2= 1,5
6 2/5:1 7/9= 32/5:16/9=32/5•9/16=288/90