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好吧问答库 > 打圻前,买80件a商品和30件b商品用了1080元,买50件a商品和10件b商品用了840元,打折

打圻前,买80件a商品和30件b商品用了1080元,买50件a商品和10件b商品用了840元,打折

2025年03月15日 15:09

有1个网友回答

网友（1）：

1、设打折前a商品单价为a，b商品单价为b：
80a+30b=1080
50a+10b=840
解方程，得出：
a=20.57
b=-18.9
这道题解出来b商品的价格是负数。有问题。请再确认一下题目有没有写错的地方。

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