| 1 |
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| 6305 |
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| 256 |
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| 256 |
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| 6561 |
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| 256 |
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(2008·益阳)有一种石棉瓦(如图),每块宽60厘米,用于铺盖屋顶时,每相邻两块重叠部分的宽都为10厘米,那么n(n为正整数)块石棉瓦覆盖的宽度为( )