1 1/4 * (- 2 2/3) + 4/5 * 2 11/12 - 1 1/6 : 21/22 = - 2 2/9
1) 1 1/4 * (- 2 2/3) = 5/4 * (- 8/3) = - 10/3 = - 3 1/3
2) 4/5 * 2 11/12 = 4/5 * 35/12 = 7/3 = 2 1/3
3) 1 1/6 : 21/22 = 7/6 * 22/21 = 22/18 = 1 4/18 = 1 2/9
4) - 3 1/3 + 2 1/3 = - 1
5) - 1 - 1 2/9 = - 2 2/9