4 1 5 x 1 7 9 July 8, 2019 16 32 64 128 2 4 5 x 1 7 9 4 4 5 x 1 1 9 x 1 7 8 4 5×1 7 4 1 и 7 5 1 7/9 x = 5 4/9 2 5/8 4 1 - x = 5 4 + 4 =5
