若y=x方log2 a+2xloga 2+8的图像在x轴的上方,求a的范围!(是x方乘以以2为底a的对数+2x乘以以a为底2的对数+8)
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![若y=x方log2 a+2xloga 2+8的图像在x轴的上方,求a的范围!(是x方乘以以2为底a的对数+2x乘以以a为底2的对数+8)](/uploads/image/z/4481112-48-2.jpg?t=%E8%8B%A5y%3Dx%E6%96%B9log2+a%2B2xloga+2%2B8%E7%9A%84%E5%9B%BE%E5%83%8F%E5%9C%A8x%E8%BD%B4%E7%9A%84%E4%B8%8A%E6%96%B9%2C%E6%B1%82a%E7%9A%84%E8%8C%83%E5%9B%B4%21%EF%BC%88%E6%98%AFx%E6%96%B9%E4%B9%98%E4%BB%A5%E4%BB%A52%E4%B8%BA%E5%BA%95a%E7%9A%84%E5%AF%B9%E6%95%B0%2B2x%E4%B9%98%E4%BB%A5%E4%BB%A5a%E4%B8%BA%E5%BA%952%E7%9A%84%E5%AF%B9%E6%95%B0%2B8%EF%BC%89)
若y=x方log2 a+2xloga 2+8的图像在x轴的上方,求a的范围!(是x方乘以以2为底a的对数+2x乘以以a为底2的对数+8)
若y=x方log2 a+2xloga 2+8的图像在x轴的上方,求a的范围!(是x方乘以以2为底a的对数+2x乘以以a为底2的对数+8)
若y=x方log2 a+2xloga 2+8的图像在x轴的上方,求a的范围!(是x方乘以以2为底a的对数+2x乘以以a为底2的对数+8)
令log2 a=m,则loga 2=1/m.原方程即为:mx^2 +2x/m+8=0,图像在x轴上方,即开口向上,
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