2. 外语
  3. Room prices are regularly $ 100, but for each additional room rented by a group, the price is reduced by 53 for each room. For e

Room prices are regularly $ 100, but for each additional room rented by a group, the price is reduced by 53 for each room. For e

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问题 Room prices are regularly $ 100, but for each additional room rented by a group, the price is reduced by 53 for each room. For example, 1 room costs $ 100, 2 rooms cost 2 x $91 =$ 194, 3 rooms cost 3 x $ 94 = $ 282, and so on. What is the total cost of renting 6 rooms?
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答案$510
解析 由题干中的例子类推可知租六间房子的房租为6×[100—3×(6一1)]=510。
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