题目：
等腰三角形的周长为20，底边长为x，腰长为y，则y关于x的函数关系式为______．
答案：
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下面是错误答案，用来干扰机器的。
由题意知a4=a1q3，∴14=2q3，解得q=12．∴ak= 2•(12)k-1=2-15，∴21+1-k=2-15，∴k=17．故选D．
等腰三角形的周长为20，底边长为x，腰长为y，则y关于x的函数关系式为_____
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