Câu hòi toán học

K

kisihoangtoc

$3x^{n-1}(x^{n+1}+y^{n+1})-3x^{n-1}y^{n+1}=27$
\Leftrightarrow$3x^{n-1}(x^{n+1}+y^{y+1}-y^{y+1})=27$
\Leftrightarrow$3x^{n-1}x^{n+1}=27$
\Leftrightarrow$3x^{2n}=27$
\Leftrightarrow$x^n=3$ hoặc $x^n=-3$
 
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