4/9 = 8x/45
5x/12=2/3
6/7 = 10x/21
8/9 = 4x/27
27/5x = 9/16
Решите все)))

1)4/9=8x/45180=72x72x=180x=5/22)5x/12=2/315x=24x=8/53)6/7=10x/21126=70x70x=126x=9/54)8/9=4x/27216=36x36x=21x=65)27/5x=9/1627/5x=9/16, x≠0432=45x45x=432x=48/5, x≠0x=48/5