-6.28×17.6+6.28×(-23.3)-1.57×36.4= -6.28×(17.6+23.3+9.1)= -6.28×50= -314
-6.28×17.6+6.28×(-23.3)-1.57×36.4=-6.28×17.6-6.28×23.3-6.28×9.1=-6.28×(17.6+23.3+9.1)=-6.28×50=-314