简答题：某商品的需求函数为Q＝100－5P，其中Q为需求量，P为价格，求需求的价格弹性函数，并求P＝10时的价格弹性．

题目内容：
某商品的需求函数为Q＝100－5P，其中Q为需求量，P为价格，求需求的价格弹性函数，并求P＝10时的价格弹性．
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