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Tìm x, y nguyên biết:2x+3y+5xy=5
$2x+3y+5xy=5
\\\Leftrightarrow 10x+15y+25xy=25
\\\Leftrightarrow 25xy+15y+10x+6=31
\\\Leftrightarrow 5y(5x+3)+2(5y+3)=31
\\\Leftrightarrow (5x+3)(5y+2)=31$
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