5.6×0.7+ 5.6×0.4-0.5=5.6*(0.7+0.4)-0.5=5.6*1.1-0.5=5.6*1+5.6*0.1-0.5=5.6+0.56-0.5=5.66
5.6X0.7+5.6X0.4-0.5=5.6X(0.7+0.4)-0.56+0.06=5.6X(1.1-0.1)+0.06=5.6+0.06=5.66