3/8y =2,25 8,4 : x = 2 1/3 x :5/9 =3,6 y : 1,2 = 1 2/3 0,6x=9/20 5/6y =0,5

1) 3/8 * y = 2,25;

у = 225/100 * 8/5 = 9/4 * 8/5 = (9 * 8)/(4 * 5) = 18/5 = 36/10 = 3,6.

2) 84/10 : x = 2 1/3;

х = 84/10 : (2 * 3 + 1)/3 = 84/10 : 7/3 = 84/10 * 3/7 = (84 * 3)/(10 * 7) = (12 * 3)/10 = 36/10 = 3,6.

3) x : 5/9 = 36/10;

х = 36/10 * 5/9 = (36 * 5)/(10 * 9) = (4 * 5)/10 = 20/10 = 2.

4) y : 12/10 = 1 2/3;

у = (1 * 3 + 2)/3 * 12/10 = 5/3 * 12/10 = (5 * 12)/(3 * 10) = (5 * 4)/10 = 2.

5) 6/10 * x = 9/20;

х = 9/20 * 10/6 = 90/120 = 3/4.

6) 5/6 * y = 5/10;

у = 5/10 * 6/5 = 30/50 = 3/5.