1) (- 3/4 - 0,25) * 3/4 * 1 1/3 + 2/15 = (- 0,75 - 0,25) * 3/4 * 4/3 + 2/15 = - 1 + 2/15 = (2 - 15)/15 = - 13/15.
2) (23 5/6 - 50) : (54,3 - 70) = (23 * 6 + 5)/6 - 50 * 6/6) : (- 15,7) = (- 157/6) : (- 157/10) = 10/6 = 5/3 = 1 2/3.
1) (- 3/4 - 0,25) * 3/4 * 1 1/3 + 2/15 = (- 0,75 - 0,25) * 3/4 * 4/3 + 2/15 = - 1 + 2/15 = (2 - 15)/15 = - 13/15.
2) (23 5/6 - 50) : (54,3 - 70) = (23 * 6 + 5)/6 - 50 * 6/6) : (- 15,7) = (- 157/6) : (- 157/10) = 10/6 = 5/3 = 1 2/3.