(0,4 - 11/15) * 1(2/7)) - (2/18 - 0,5)/1(4/5). 0,4 – 11/15 = 2/5 – 11/15 = 6/15 – 11/15 = -5/15 = -1/3 (-1/3) * 1(2/7) = (-1/3) * (9/7) = -3/7. 2/18 – 0,5 = 2/18 – 1/2 = 2/18 – 9/18 = -7/18. -7/18)/1(4/5) = (-7/18)/(9/5) = (-7/18) * (5/9) = -35/162. -3/7 – (-35/162) = (-486 – (-245))/1134 = -241/1134. Странный ответ, проверьте условие.