Đặt `A=x^2+16/x +2011`

`A=x^2+8/x+8/x+2011`

`=>A >=3\root{3}{x^2 .8/x .8/x}+2011`

`=>A >=2023`

Dấu `=` xảy ra khi:

`x^2=8/x`

`=>x=2`

Vậy `"Min"A=2023` khi và chỉ khi `x=2`

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