Question

4 1/2*(-4,05)*(-1 1/9)

Answer 1

4 1/2 * (-4,05) * (-1 1/9) =  20 1/4  (или  20,25),

1) 4 1/2 * (-4,05) = -9/2 * 405/100 = -729/40 = -18 9/40  (или  -18,225),
2) -18 9/40 * (-1 1/9) = 729/40 * 10/9 = 81/4 = 20 1/4  (или 20,25)