已知a>0,b>0,a+b=2,则y=1/a+4/b的最小值是().我知道答案是9/2.但是这题过程中我有个疑问.请求高手指点迷津.
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![已知a>0,b>0,a+b=2,则y=1/a+4/b的最小值是().我知道答案是9/2.但是这题过程中我有个疑问.请求高手指点迷津.](/uploads/image/z/10206697-49-7.jpg?t=%E5%B7%B2%E7%9F%A5a%3E0%2Cb%3E0%2Ca%2Bb%3D2%2C%E5%88%99y%3D1%2Fa%2B4%2Fb%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%EF%BC%88%EF%BC%89.%E6%88%91%E7%9F%A5%E9%81%93%E7%AD%94%E6%A1%88%E6%98%AF9%2F2.%E4%BD%86%E6%98%AF%E8%BF%99%E9%A2%98%E8%BF%87%E7%A8%8B%E4%B8%AD%E6%88%91%E6%9C%89%E4%B8%AA%E7%96%91%E9%97%AE.%E8%AF%B7%E6%B1%82%E9%AB%98%E6%89%8B%E6%8C%87%E7%82%B9%E8%BF%B7%E6%B4%A5.)
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