Răspuns :

axb=5x(-2)=-10bxa=(-2)x5=-10 bxc=-(-2)x(-13)=-26 (axb)xc=5x(-2)x(-13)=5x(-26)=-130 ax(b+c)=5x(-2)+(-13)=5x(-15)=-75 axb+axc=5x(-2)+5x(-13)=-10+(-65)=-650