这道基本不等式例题看不懂第二行开始解释下好么哪个公式啊,4都求出来了后面两行做什么的看不懂
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![这道基本不等式例题看不懂第二行开始解释下好么哪个公式啊,4都求出来了后面两行做什么的看不懂](/uploads/image/z/1117408-40-8.jpg?t=%E8%BF%99%E9%81%93%E5%9F%BA%E6%9C%AC%E4%B8%8D%E7%AD%89%E5%BC%8F%E4%BE%8B%E9%A2%98%E7%9C%8B%E4%B8%8D%E6%87%82%E7%AC%AC%E4%BA%8C%E8%A1%8C%E5%BC%80%E5%A7%8B%E8%A7%A3%E9%87%8A%E4%B8%8B%E5%A5%BD%E4%B9%88%E5%93%AA%E4%B8%AA%E5%85%AC%E5%BC%8F%E5%95%8A%2C4%E9%83%BD%E6%B1%82%E5%87%BA%E6%9D%A5%E4%BA%86%E5%90%8E%E9%9D%A2%E4%B8%A4%E8%A1%8C%E5%81%9A%E4%BB%80%E4%B9%88%E7%9A%84%E7%9C%8B%E4%B8%8D%E6%87%82)
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