1.设甲成本为X,乙成本为Y
X+Y=500
X*(1+50%)*0.9+Y*(1+40%)*0.9=657
解得 X=300,Y=200
2.设彩电售价为X,洗衣机售价为Y
(X+Y)*0.13=390
X-Y=1000
解得 X=2000,Y=1000
1.设甲成本为X,乙成本为Y
X+Y=500
X*(1+50%)*0.9+Y*(1+40%)*0.9=657
解得 X=300,Y=200
2.设彩电售价为X,洗衣机售价为Y
(X+Y)*0.13=390
X-Y=1000
解得 X=2000,Y=1000