1) 1)-6 2/3+3 = 3 2/3
2) 3-4,5= -1,5
3)3 2/3*(-1,5)=3 2/3*(-15/10)= -11/3*15/10= -55/10= -5,5
4)-5,5 * 5/17=-55/10*5/17= -55/34= -1 21/34
2) 1) -2 1/2 *8= - 5/2*8= - 40/2= -20/1=-20
2)-6*1 4/5= -6*9/5=-54/5= -10 4/5
3) -20 - (-10 4/5)= -9 1/5
4)-9 1/5*0,5= -9 1/5* 5/10= -46/5*5/10=-46/10= -4,6