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方法一:設商品的購入價是x元,則定價是(x+960)元 (x+960)*80%=x-832 x=8000 方法二:設商品定價為X,則購入價為X-960 80%*X=X-960-832 X=8960 商品定價為8960元,購入價8960-960=8000 則商品的購入價為8000元
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