(1-30%)x=(1-40%)x+560解: 70%x=60%x+56070%x-60%x=56010%x=560x=560÷0.1x=5600检验: (1-30%)×5600=(1-40%)×5600+560=3920
（1-30%）x=（1-40%）x+5600.7x=0.6x+5600.1x=560x=5600
