12/3 * x + y : 19,5 при x =3,6 при y =2 8/9

1 2/3 * х + у : 19,5
х = 3,6
у = 2 8/9
1 2/3 * 3 3/5 + 2 8/9 : 19 1/2 = 6 2/27
1) 1 2/3 * 3 3/5 = 5/3 * 18/5 = 1/1 * 6/1 = 6
2) 2 8/9 : 19 1/2 = 26/9 * 2/39 = 1/9 * 2/3 = 2/27
3) 6 + 2/27 = 6 2/27