помогите он трудный
$_$ *-*
;(((((((((

((1 11/14 - 4 5/7) * (-4 2/3) + (1 5/8 - 3 2/9) * 18/25) : (-2 3/4) = = ((1 11/14 - 4 10/14) * (-4 2/3) + (1 45/72 - 3 16/72) * 18/25) : (-2 3/4) == (2 13/14 * 4 2/3 + (-1 43/72) * 18/25) : (-2 3/4) == (41/14 * 14/3 + (-115/72) * 18/25) : (-2 3/4) == (41/3 - 23/8 * 2/5) : (-11/4) == (41/3 - 115/4) : (-11/4) == (-181/12):(-11/4) == 181/12 * 4/11 ==  181/3 * 1/11 == 181/33 == 5 16/33