设原价为X,成本为Y
0.95X-Y=200
0.8X-Y=-75
求这个二元一次方程就可以了
0.15X=275
X=1833.333333
一件商品打九折可盈利200元打八折则亏损75元原价是多少?
一件商品打九折可盈利200元打八折则亏损75元原价是多少?
数学人气:451 ℃时间:2020-03-24 20:45:15
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