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某工厂生产一种机器的固定成本为5000元，且每生产100台需要投入2500元，对销售市场进行调查后，得知市场对此产品的需求量为每年500台，且销售收入可看作是函数 y=500x- 1 2 x 2 ，其中x是产品售出的数量，且0≤x≤500，已知此机器重要部件更新换代快，若造成积压，第二年无法卖出或无利可图． （1）分别写出当0≤x≤500及x＞500时利润w与年产量x之间的函数关系式； （2）请你运用函数知识，为该厂厂长设计一个最佳的生产计划，并求出由此计划获得的最大年利润是多少？
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