2 3 5 8 12 17 23 30 38 47
<span>2+1=3 </span>
<span>3+2=5 </span>
<span>5+3=8 </span>
<span>8+4=12 </span>
<span>12+5=17 </span>
<span>17+6=23 </span>
<span>23+7=30 </span>
<span>30+8=38 </span>
<span>38+9=47</span>
цилиндр
132132132132132132132132132132132
17 х - х + 5 х =170 +19
21 х = 189
х = 189 : 21
х = 9
Проверка
17 х 9 - 9 + 5 х 9 - 19 = 170
170 = 170
17 х 9 - 9 +5 х 9 - 19 = 153 - 9 +45 - 19 = 144+45 = 19 = 189 - 19 = 170