填空题 适中0.65 引用4 组卷200
如图所示,图①是边长为1的等边三角形纸板,周长记为C1,沿图①的底边剪去一块边长为
的等边三角形,得到图②,周长记为C2,然后沿同一底边
依次剪去一块更小的等边
三角形纸板(即其边长为前一块被剪掉等边三角形纸板边长的
),得图③④…,图n的周长记为Cn,若n≥3,则Cn-Cn-1=_____ .
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/32811ae2b8ad4200b0e56cfd202d44b4.png?resizew=96)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/1d0a91793ccd4ebb8dbf31a4f2ffca54.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/bed738ef7c444ee7928f8ae15ca9ef12.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/9c7dc3ea068b42b4a4359ef04ef51ebc.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/f806c6d940e34520903b18747abb081c.png?resizew=89)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/eab78574383a4029bc864f508ed8e2f8.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465504256/STEM/32811ae2b8ad4200b0e56cfd202d44b4.png?resizew=96)
17-18八年级·山东济宁·期末
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