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小店卖 2 种产品。5A + 3B = R$ 110，2A + 4B = R$ 80。价格。（答：A=10，B=15。）
小店卖 2 种产品。5A + 3B = R$ 110，2A + 4B = R$ 80。价格。（答：A=10，B=15。）
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