E
em_be


giup minh voi:
cho x,y t/m: [tex](x+y).x.y=x^2+y^2-x.y[/tex]
hãy tìm [tex]MAX \ A=\frac{1}{x^3}+\frac{1}{y^3}[/tex]
cho x,y t/m: [tex](x+y).x.y=x^2+y^2-x.y[/tex]
hãy tìm [tex]MAX \ A=\frac{1}{x^3}+\frac{1}{y^3}[/tex]
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