2/3*5/7-3/14:(-4.1/2)-2.2/3
1) 3/14 : (- 4 1/2) = 3/14 : (-9/2) = 3/14 * (-2/9) = -2/42 = -1/21
2) 2/3 * 5/7 = 10/21
3) 10/21 - (-1/21) = 10/21 + 1/21 = 11/21
4) 11/21 - 2 2/3 = 11/21 - 8/3 = 11/21 - 56/21 = - 45/21 = - 2 3/21 = - 2 1/7