2/9 * Х = 5/12

4/15 * у = 2/5

3/5 * Х = 6

7/8 * у = 14

3/7 * Х = 1 целая 4/5

9/10 * у = 4 целых 1/2

2/9 х=5/12

х=5/12:2/9

х=5/12*9/2

х=5/4*3/2

х=15/8

х=1 7/8

4/15 у=2/5

у=2/5:4/15

у=2/5*15/4

у=1/1*3/2

у=3/2

у=1 1/2

3/5 х=6

х=6:3/5

х=6/1:3/5

х=6/1*5/3

х=2/1*5/1

х=10/1=10

7/8 у=14

у=14:7/8

у=14/1:7/8

у=14/1*8/7

у=2/1*8/1

у=16/1=16

3/7 х=1 4/5

х=1 4/5:3/7

х=9/5*7/3

х=3/5*7/1

х=21/5

х=4 1/5

9/10 у=4 1/2

у=4 1/2:9/10

у=9/2*10/9

у=1/1*5/1

у=5/1

у=5