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(2)若市场需求量为Q，它近似满足Q()=，当P=Q时的市场价格称为市场平衡价格，为使市场平衡价格不低于9元，求税率的最小值．

	Floor 1 名字不能给用 7/25/14 23:05
	Floor 2 巨大八爪鱼 7/26/14 18:18 是19 /192  约为9.90%

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