T
thachkimson


Tìm x,y biết
$$\dfrac{1}{\sqrt{x}} +\dfrac{1}{\sqrt{y}}=4-\sqrt{x} -\sqrt{y}$$
$$\dfrac{1}{\sqrt{x}} +\dfrac{1}{\sqrt{y}}=4-\sqrt{x} -\sqrt{y}$$
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