如图,已知△ABC与△BDE都是等边三角形,点D在边AC上(不与A、C重合),DE与AB相交于点F,△BCD∽△DAF若BC=1,设CD=x,AF=y.(1)求Y关于X的函数解析式及定义域(2)当x为何值时,S△BEF:S△BCD=7:
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![如图,已知△ABC与△BDE都是等边三角形,点D在边AC上(不与A、C重合),DE与AB相交于点F,△BCD∽△DAF若BC=1,设CD=x,AF=y.(1)求Y关于X的函数解析式及定义域(2)当x为何值时,S△BEF:S△BCD=7:](/uploads/image/z/7210893-21-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E4%B8%8E%E2%96%B3BDE%E9%83%BD%E6%98%AF%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E7%82%B9D%E5%9C%A8%E8%BE%B9AC%E4%B8%8A%28%E4%B8%8D%E4%B8%8EA%E3%80%81C%E9%87%8D%E5%90%88%29%2CDE%E4%B8%8EAB%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%E2%96%B3BCD%E2%88%BD%E2%96%B3DAF%E8%8B%A5BC%3D1%2C%E8%AE%BECD%3Dx%2CAF%3Dy.%EF%BC%881%EF%BC%89%E6%B1%82Y%E5%85%B3%E4%BA%8EX%E7%9A%84%E5%87%BD%E6%95%B0%E8%A7%A3%E6%9E%90%E5%BC%8F%E5%8F%8A%E5%AE%9A%E4%B9%89%E5%9F%9F%EF%BC%882%EF%BC%89%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2CS%E2%96%B3BEF%3AS%E2%96%B3BCD%3D7%3A)
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