<span>16,1-(X-3,8)=11,3
16,1-х+3,8=11,3
19,9-х=11,3
х=19,9-11,3
х=8,6
</span><span>25,34-(2,7+y)=15,34
25,34-2,7-у=15,34
22,64-у=15,34
у=22,64-15,34
у=7,3</span>
(7 - 1 5/12) : 6,7 + (5,75 - 3 1/6) : 15,5 = 1,
1) 7 - 1 5/12 = 6 12/12 - 1 5/12 = 5 7/12,
2) 5 7/12 : 6,7 = 67/12 : 67/10 = 67/12 * 10/67 = 10/12 = 5/6,
3) 5,75 - 3 1/6 = 575/100 - 19/6 = 1725/300 - 950/300 = 775/300 = 2 7/12,
4) 2 7/12 : 15,5 = 31/12 : 155/10 = 31/12 * 10/155 = 1/6,
5) 5/6 + 1/6 = 6/6 = 1
179
1-сотые
7-десятые
9-единичные
179+20= 199