解:设冰箱原价为x1.4xX0.8=x+2701.12x=x+2700.12x=270x=2250
2250
=270/{[(1+0.4)*0.8]-1}=2250元
1.4*0.8x-x=270,解得x=2250
1.4乘0.8x-x=270, x=2250