题目内容：
如图，用火柴棍拼成一个由三角形组成的图形，拼第一个图形共需要3根火柴棍，拼第二个图形共需要5根火柴棍；拼第三个图形共需要7根火柴棍；……照这样拼图，则第n个图形需要___________根火柴棍．
参考答案：
答案解析：
选择题：如图，用火柴棍拼成一个由三角形组成的图形，拼第一个图形共需要3根火柴棍，拼第二个图形共需要5根火柴棍；拼第三个图形共需要7根火柴棍；……照这样拼图，则第n个图形
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- 题目类型：选择题
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某校七年级1班50名同学在“森林草原防灭火”知识竞赛中的成绩如表所示：成绩60708090100人数3913169则这个班学生成绩的众数、中位数分别是（ ）
某校七年级1班50名同学在“森林草原防灭火”知识竞赛中的成绩如表所示：成绩60708090100人数3913169则这个班学生成绩的众数、中位数分别是（ ）
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