4 5/6х-2 5/6х=24;
2х = 24,
х = 12,
3 1/8*2/5*1 1/15 = 25/8 * 2/5 * 16/15 = 4/3= 1 1/3;
(4 1/5-3 1/3)*3 3/4+1/4 =
= (21/5-10/3)*15/4+1/4 =
= (63/15-50/15)*15/4+1/4 =
= 13/15*15/4+1/4 =
= 13/4+1/4 =
= 14/4 = 7/2 = 3 1/2,
9 2/3*1,2+2 2/3*1,2-2 1/3*1,2 =
= 1,2*(9 2/3+2 2/3-2 1/3) =
= 1,2 * 9 3/3 =
= 1,2 * 10 = 12
Х+ 16 = 279 : 9
х + 16 = 31
х = 31 - 16
х = 15
<u><em>Ответ: 15</em></u>
1 рубль - 100 копеек
100/5=20 копеек по 5 копеек
100-20=80 копеек осталось
80/2=40 копеек по 2 копейки
Один из вариантов