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Posted by doan lang on 17-04-2005 - 08:08
Tìm $x,y$ dương sao cho:
$$\frac{x+y}{2};\sqrt{xy};\dfrac{2xy}{x+y};\sqrt{\dfrac{x^2+y^2}{2}}$$
có tổng bằng $66$ và chúng đều không nguyên.