用3根火柴棒搭成1个三角形,接着用火柴棒按如图所示的方式搭成 2

3根火柴棒搭成1个三角形,接着用火柴棒按如图所示的方式搭成

2个三角形,再用火柴棒搭成3个三角形、4个三角形…

(1)填写下表

三角形个数

4

5

6

7

火柴棒数

2)照这样的规律搭下去,搭n个这样的三角形需要        根火柴棒。

3)若用了2001根火柴棒,搭成的图案中有        个三角形。

答案

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