Chủ đề này có 1 trả lời

[stuart clark]

Cho $x,y,z,t>0,$ Tim Min $x^5+3\sqrt{3}\; y^5+\sqrt{3}z^5+t^5-15xyzt$

[DOTOANNANG]

$$\begin{equation}\begin{split} \min\,\left \{ x^{\,5}+ a\,y^{\,5}+ b\,z^{\,5}+ t^{\,5}- d\,xyzt \right \}= c= constant \end{split}\end{equation}$$

$<$$=$$>$

$$\begin{equation}\begin{split} x^{\,5}+ a\,y^{\,5}+ b\,z^{\,5}+ t^{\,5}+ c= d\,xyzt \end{split}\end{equation}$$

$<$$=$$>$

$$\begin{equation}\begin{split} c= \frac{\left ( \frac{d}{5} \right )^{\,5}}{ab} \end{split}\end{equation}$$

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