2 1/7:2,5=8,4:7х____________7 1/3:1 5/6=0,6х:0,75

2 1/7:2,5=8,4:7х15/7:25/10=84/10:7х7х*15/7=84/10*25/107х*15/7=217х=21:15/77х=147/157х=9,8х=1,47 1/3:1 5/6=0,6х:0,7522/3:11/6=0,6х:75/1000,6х*11/6=22/3*75/1000,6х*11/6=5,50,6х=3х=5