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北师大版数学七年级下册第 9页出现了这样一道探索题 :下面是用棋子排成的“小屋子”图 1摆第 1个“小屋子”要 5枚棋子 ,摆第 2个需要 1 1枚 ,摆第 3个需要枚棋子。按照这样的方式继续摆下去。①摆第 1 0个这样的“小屋子”需要多少枚棋子 ?②摆第n个这样的“小屋子”需要多少
Beijing Normal University’s Mathematical Math Grade 7 booklet appeared on page 9 of this exploration question: The following is a “small house” lined up with chess pieces. Figure 1 puts the first “small house” to have 5 pieces and puts the 2nd need 1 1 and placing 3rd needs pieces. Continue in this way. How many pieces are required to place the 1st 0th such “small house”? How much is it needed to place the nth “small house”?