(1)12.3x7.3-123x0.53=12.3x7.3-12.3x5.3=12.3x(7.3-5.3)=12.3x2=24.6(2)12.3x7.3-123x0.53=123x0.73-123x0.53=123x(0.73-0.53)=123x0.2=24.6
