(6,75+ (-45) * 1 2/3) * (-1 1/3)³ =
= (6,75 - 45 * 5/3) * (-4/3)³ =
= (6,75 - 75) * (- 64/27) =
= (- 68,25) * (-64/27) =
= (- 68 1/4) * (- 64/27) =
= 273/4 * 64/27 =
= 91 * 16 /9 = 1456/9 = 161 7/9
ответ: 161и7/9
