(5 4/5- 7 2/3): [2 4/5] =?

Question

(5 4/5- 7 2/3): [2 4/5] =?

Answer 1

(5 4/5 - 7 2/3) : (2 4/5) = (29/5 - 23/3) : (2 4/5) = (87/15 - 115/15) : (14/5) = (- 28/15) : (14/5) = (- 28/15) * (5/14) = - 2/3

Answer 2

Это какой класса. скпжи