Bài 1: Tìm nghiệm nguyên dương
$\frac{1}{x^{2}}+\frac{1}{y^{2}}+\frac{1}{z^{2}}= 1$
Bài 2:Tìm nghiệm nguyên
$x^{2}+y^{2}=xy +2x +3y-2$
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