A
alomaxes


Cho x,y dương tìm min
(x^4+y^4)/(x+y)^4+(x^2+y^2)/(x+y)^2
$$\frac{x^4+y^4}{(x+y)^4} + \frac{x^2+y^2}{(x+y)^2}$$
(x^4+y^4)/(x+y)^4+(x^2+y^2)/(x+y)^2
$$\frac{x^4+y^4}{(x+y)^4} + \frac{x^2+y^2}{(x+y)^2}$$
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