частное.....
......................
1) 19>17 19>13 19>15 19>18
2) 17<19 17>13 17>15 17<18
3) 13<19 13<17 13<15 13<18
4) 15<19 15<18 15<17 15>13
5) 18<19 18>17 18>15 18>13
3 ^ X * ( 3 - 2 * 1/9 ) = 75
3 ^ X * ( 3 - 2/9 ) = 75
3 ^ X * ( 27/9 - 2/9 ) = 75
3 ^ X = 75 : 25/9
3 ^ X = 3
X = 1