1) -1 4/5*(-15) 2) -1,95-8,68 3) -7-(-4)+3 4) -2,16:3/50 5) 1 1/8-3 5/6

1) -1 (4/5) * (-15) = (-9/5) * (-15) = 27. 2) -1,95 - 8,68 = -10,63. 3) -7 - (-4) + 3 = -7 + 4 + 3 = 0. 4) -2,16 / (3/50) = -2,15 / 0,06 = -215/6 = -35(5/6). 5) 1(1/8) – 3(5/6) = (9/8) – (23/6) = (27/24) – (92/24) = -65/24 = -2(17/24).