T
thieukhang61


Tìm x,y thuộc Z:
3x + 17y = 159
x.y - x - y = 2
$x^2- y^2 = 1998$
[TEX]\frac{1}{x}[/TEX]+[TEX]\frac{1}{y}[/TEX]=[TEX]\frac{1}{3}[/TEX]
$2^x+3^x=5^x$
3x + 17y = 159
x.y - x - y = 2
$x^2- y^2 = 1998$
[TEX]\frac{1}{x}[/TEX]+[TEX]\frac{1}{y}[/TEX]=[TEX]\frac{1}{3}[/TEX]
$2^x+3^x=5^x$
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