1) 2/3•(-1/2)=-1/3; (-3/4):(1 1/2)=-3/4:(3/2)=-3/4•2/3=-1/2; (-4/5):8=-4/5•1/8=-1/10
2) 4:(-1/2)= -4•2=-8; 5:(-5/8)=-5•8/5=-8; -6•(-3/5)=6•5/3=10;
3) -5/6:(-5/12)=5/6•12/5=2; -3 3/4:(1 1/2)=-(15/4)•(2/3)=-5/2=-2 1/2;
1 7/9:(-2 2/3)= -16/9•3/8= -2/3
4) -8 2/5:7= -42/5•1/7= -6/5=-1 1/5; -7 1/2:(-5)=15/2•1/5=3/2=1 1/2;
4 2/3:(-1 1/6)= -14/3•6/7= -4