Условие см. в приложении.
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1) х/4 = 5 2) 105/y = 7 3) (x + 12)/6 = 14
x = 5 * 4 y = 105 : 7 х + 12 = 14 * 6
<u> x = 20</u> <u>y = 15 </u> x + 12 = 84
20 : 4 = 5 105 : 15 = 7 х = 84 - 12
5 = 5 7 = 7 <u> х = 72</u>
(72 + 12) : 6 = 14
84 : 6 = 14
14 = 14
21+7k=33+5k
7k-5k=33-21
2k=12
k=6
(13/9+7/6)*9/5-28/9:7/3=47/18*9/5-4/3=47/10-4/3=(141-40)/30=101/30=3целых11/30