小华在劳动技术课中按制作一个如图所示的等腰△ABC,已知它的周长为40cm,设底边BC长为y cm,设腰AB为x cm.(1)请你写出底边长y与腰长x的函数解析式; (2)求出自变量x的取值范围; (3)当腰长AB的长x=15
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![小华在劳动技术课中按制作一个如图所示的等腰△ABC,已知它的周长为40cm,设底边BC长为y cm,设腰AB为x cm.(1)请你写出底边长y与腰长x的函数解析式; (2)求出自变量x的取值范围; (3)当腰长AB的长x=15](/uploads/image/z/10770727-31-7.jpg?t=%E5%B0%8F%E5%8D%8E%E5%9C%A8%E5%8A%B3%E5%8A%A8%E6%8A%80%E6%9C%AF%E8%AF%BE%E4%B8%AD%E6%8C%89%E5%88%B6%E4%BD%9C%E4%B8%80%E4%B8%AA%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E7%AD%89%E8%85%B0%E2%96%B3ABC%2C%E5%B7%B2%E7%9F%A5%E5%AE%83%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA40cm%2C%E8%AE%BE%E5%BA%95%E8%BE%B9BC%E9%95%BF%E4%B8%BAy+cm%2C%E8%AE%BE%E8%85%B0AB%E4%B8%BAx+cm.%281%29%E8%AF%B7%E4%BD%A0%E5%86%99%E5%87%BA%E5%BA%95%E8%BE%B9%E9%95%BFy%E4%B8%8E%E8%85%B0%E9%95%BFx%E7%9A%84%E5%87%BD%E6%95%B0%E8%A7%A3%E6%9E%90%E5%BC%8F%3B+%282%29%E6%B1%82%E5%87%BA%E8%87%AA%E5%8F%98%E9%87%8Fx%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3B+%283%29%E5%BD%93%E8%85%B0%E9%95%BFAB%E7%9A%84%E9%95%BFx%3D15)
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