(-6 2/5 +3) *( 3-4.5)* 5/17=(-3 2/5)*(-1,5) *5/17= 17*3*5 /5*2*17=3/2=1 1/2= 1,5 2) (-2 1/2*8- (-6)*1 4/5)*0.5=- 5*8 /2 - (-6*9*1 /5*2)= -20 -(-54/10)= -20 +5,4=-14,6 3) 7 3/5 * (-2,5) * 4 3/20 * (-10)*2 - 3 4/25= 38*5*83*20 / 5*20*2 -3 4/25=38*83 -3 4/25=1577-3 4/25=1573 21/25