2 9 х 11 7 July 8, 2019 16 32 64 128 2 9 11 7 2 3 11 х 7 9 11 9 х 7 2 5 18 11 88 х 2 9 )= 2 7 2 9-11 9-2х 11 2 9 - х = 14 7