已知x+3y-2=0,则3^x+27^Y+1的最小值是?选项中没7这个答案,但用3元的均值不等式做出来有答案,我想问下3元的和2元的作法有什么不一样
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![已知x+3y-2=0,则3^x+27^Y+1的最小值是?选项中没7这个答案,但用3元的均值不等式做出来有答案,我想问下3元的和2元的作法有什么不一样](/uploads/image/z/1857892-4-2.jpg?t=%E5%B7%B2%E7%9F%A5x%2B3y-2%3D0%2C%E5%88%993%5Ex%2B27%5EY%2B1%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%3F%E9%80%89%E9%A1%B9%E4%B8%AD%E6%B2%A17%E8%BF%99%E4%B8%AA%E7%AD%94%E6%A1%88%2C%E4%BD%86%E7%94%A83%E5%85%83%E7%9A%84%E5%9D%87%E5%80%BC%E4%B8%8D%E7%AD%89%E5%BC%8F%E5%81%9A%E5%87%BA%E6%9D%A5%E6%9C%89%E7%AD%94%E6%A1%88%2C%E6%88%91%E6%83%B3%E9%97%AE%E4%B8%8B3%E5%85%83%E7%9A%84%E5%92%8C2%E5%85%83%E7%9A%84%E4%BD%9C%E6%B3%95%E6%9C%89%E4%BB%80%E4%B9%88%E4%B8%8D%E4%B8%80%E6%A0%B7)
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