4.9×0.6-4.8×0.5
=2.94-2.4
=0.54
4.9*0.6-4.8*0.5=4.9*0.5+4.9*0.1-4.8*0.5乘法分配律简便运算=(4.9-4.8)*0.5+0.49=0.1*0.5+0.49=0.05+0.49=0.54
4.9*0.6-4.8*0.5=(5-0.1)*0.6-(5-0.2)*0.5=3-0.06-2.5+0.1=3-2.5+0.1-0.06=0.6-0.06=0.54