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我市某中学要印制本校高中招生的录取通知书,有两个印刷厂前来联系制作业务,甲厂的优惠条件是:按每份定价1.5元的八折收费,另收900元制版费;的优惠条件是:每份定价1.5元的价格不变,而制版费900元则六折优惠.且甲都规定:一次印刷数量至少是500份. (1)分别求两个印刷厂收费y(元)与印刷数量x(份)的函数关系,并指出自变量x的取值范围. (2)如何根据印刷的数量选择比较合算的方案?如果这个中学要印制2000份录取通知书.那么应当选择哪一个厂?需要多少费用?
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