1)2/9x=5/12 2)4/15y=2/5 3)3/5x=6 4)7/8y=14 5)3/7x=1целая4/5 6)9/10y=4целых1/2

1) 2/9 * x = 5/12;

х = 5/12 : 2/9 = 5/12 * 9/2 = (5 * 9)/(12 * 2) = 15/8;

2) 4/15 * y = 2/5;

у = 2/5 : 4/15 = 2/5 * 15/4 = (2 * 15)/(5 * 4) = 3/2;

3) 3/5 * x = 6;

х = 6 : 3/5 = 6 * 5/3 = 10;

4) 7/8 * y = 14;

у = 14 : 7/8 = 14 * 8/7 = 16;

5) 3/7 * x = 1 4/5;

х = 1 4/5 : 3/7 = 9/5 * 7/3 = (9 * 7)/(5 * 3) = 21/5;

6) 9/10 * y = 4 1/2;

у = 4 1/2 : 9/10 = 9/2 * 10/9 = 10/2 = 5.