(-3,8+2 1/3)×(-1 7/8)+4 1/6÷(-1 2/3).

1) -3,8 + 2 1/3 = -3 4/5 + 2 1/3 = -3 12/15 + 2 5/15 = -1 7/15 2) -1 7/15 * (-1 7/8) = 22/15 * 15/8 = 11/4 3) 4 1/6 : (-1 2/3) = 25/6 * (-3/5) = -5/2 4) 11/4 + (-5/2) = 11/4 - 10/4 = 1/4 = 0,25