1) (3/16 - 0.45)*0.8-0.21:0.2 = (3/16 - 9/20) * 4/5 - 1.05 = -21/80 * 4/5 - 21/20 =
= - 21/20 * 1/5 - 21/20 = -21/100 - 21/20 = - 63/50 = - 1 13/50 = - 1 26/50 = - 1.26
2) 0.6(0.15 - 3/8) - 0.042 : 0.4 = 3/5 (3/20 - 3/8) - 0.105 = 3/5 * (-9/40) - 21/200 = -27/200 - 21/200 = - 48/200 = - 6/25 = - 0.24
3) -0.03(-5/9):(1.53:1.5-1.2) - 1 = -3/100 * (-5/9) : (1.02-1.2) - 1 =
= - 3/100 * (-5/9) : (-9/50) - 1 = - 1/20 * 1/3 * 50/9 - 1 = -1/2 * 1/3 * 5/9 - 1 =
= - 5/54 - 1 = -59/54 = -1 5/54
4) -2 + (1.47:1.4-1.5) * (-5/9) : (-0.13) = -2 - 0.45 * (-5/9) : (-13/100) =
= -2 - 9/20 * (-5/9) : (-13/100) = -2 - 1/20 * 5 * 100/13 = - 2 - 5 * 5/13 =
= -2 - 25/13 = - 51/13 = -3 12/13