1. (-7*-3)*(-0.5*-2)=21*1=21

2. (-1.25*-6)*(-6*5)= -30*7.5= -225

3. (-25*4)*(-5*0.2)= -100*-1=100

4. (-4*0,5)*(-20-8)=2*160=320

1)-21

2)-300

3)-100

4)-320