已知函数y=√mx^2-6mx+m+8的定义域为R.(1)求实数m的取值范围.(2)当m变化时,若y的最小值为f(m),求f(m)的取值范围.(mx^2-6mx+m+8是全部包含在根号下的哦)这题第一问我做出来了,范围是0≤m≤
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![已知函数y=√mx^2-6mx+m+8的定义域为R.(1)求实数m的取值范围.(2)当m变化时,若y的最小值为f(m),求f(m)的取值范围.(mx^2-6mx+m+8是全部包含在根号下的哦)这题第一问我做出来了,范围是0≤m≤](/uploads/image/z/7085448-0-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0y%3D%E2%88%9Amx%EF%BC%BE2-6mx%2Bm%2B8%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAR.%EF%BC%881%EF%BC%89%E6%B1%82%E5%AE%9E%E6%95%B0m%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%EF%BC%882%EF%BC%89%E5%BD%93m%E5%8F%98%E5%8C%96%E6%97%B6%2C%E8%8B%A5y%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BAf%28m%29%2C%E6%B1%82f%28m%29%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%EF%BC%88mx%EF%BC%BE2-6mx%2Bm%2B8%E6%98%AF%E5%85%A8%E9%83%A8%E5%8C%85%E5%90%AB%E5%9C%A8%E6%A0%B9%E5%8F%B7%E4%B8%8B%E7%9A%84%E5%93%A6%EF%BC%89%E8%BF%99%E9%A2%98%E7%AC%AC%E4%B8%80%E9%97%AE%E6%88%91%E5%81%9A%E5%87%BA%E6%9D%A5%E4%BA%86%2C%E8%8C%83%E5%9B%B4%E6%98%AF0%E2%89%A4m%E2%89%A4)
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