18 1.8. (1 17/18 × 1 13/14 - 25/8 ÷ 1 19/20)÷(2 25/78 - 1 1/26)=?. (14, 2 / 1,2 - 1,05)Х 1,6 =. (1/13-1/14 )×(1/14-1/6)×(1/15-1/16):(1/16-1/17). 1 13 1 14 1 13 1 14 1 27