某商品每件的进价为30元,销售价的25%用于纳税等其他费用,每日销售量P(件)于销售价x(元)之间满足关系式:P=-x+100(40<x<100).
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![某商品每件的进价为30元,销售价的25%用于纳税等其他费用,每日销售量P(件)于销售价x(元)之间满足关系式:P=-x+100(40<x<100).](/uploads/image/z/5935956-60-6.jpg?t=%E6%9F%90%E5%95%86%E5%93%81%E6%AF%8F%E4%BB%B6%E7%9A%84%E8%BF%9B%E4%BB%B7%E4%B8%BA30%E5%85%83%2C%E9%94%80%E5%94%AE%E4%BB%B7%E7%9A%8425%25%E7%94%A8%E4%BA%8E%E7%BA%B3%E7%A8%8E%E7%AD%89%E5%85%B6%E4%BB%96%E8%B4%B9%E7%94%A8%2C%E6%AF%8F%E6%97%A5%E9%94%80%E5%94%AE%E9%87%8FP%EF%BC%88%E4%BB%B6%EF%BC%89%E4%BA%8E%E9%94%80%E5%94%AE%E4%BB%B7x%EF%BC%88%E5%85%83%EF%BC%89%E4%B9%8B%E9%97%B4%E6%BB%A1%E8%B6%B3%E5%85%B3%E7%B3%BB%E5%BC%8F%EF%BC%9AP%3D-x%2B100%EF%BC%8840%26lt%3Bx%26lt%3B100%29.)
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