lam jup e bai day nka e can gap lem

T

tamtram113

sao ko aj tl jup zai trui thui tui co loi jaj ui`

\Leftrightarrow x^2-xy -kx -ky -18=0
\Leftrightarrow x^2-xy-18=k(x+y)
ta co hpt
x(x-y)=18(1)
x+y=0(2)
jaj ra ta dk
x=3 y=-3
x=-3 y=3
 
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