1.-4/3*0.75+4/3*9+(-2)*(-1/2)
=-4/3*3/4+12+1
=-1+12+1
=12
2.-45.75*23/9+(-35.25)*(-23/9)+10.5*(-67/9)
=-45.75*23/9+35.25*23/9-10.5*67/9
=23/9*(-45.75+35.25)-10.5*67/9
=23/9*(-10.5)-10.5*67/9
=-10.5*(23/9+67/9)
=-10.5*10
=-105
3.0.7*3/11-6.6*3/7-1.1*3/7+0.7*8/11
=0.7*(3/11+8/11)-3/7*(6.6+1.1)
=0.7*1-3/7*7.7
=0.7-3.3
=-2.6