…按此规律，第4个点子图共有_1个点子，第n个点子图共有_2个点子．

题干

…按此规律，第4个点子图共有____个点子，第n个点子图共有____个点子．

上一题下一题 0.0难度选择题更新时间:2018-10-05 06:48:14

10,()

n

+

1

2

根据表格内容选择最佳答案, 将其标号填入题前括号内。

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From	Material	Color	Size	Price ($)
Italy France England Germany	silk cotton wool cotton	white / blue red / yellow checked (花格的) black / brown	L / M / S M / S L / M XL / L	60-90 45-80 80-105 55-80
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