Giúp mình câu hệ với

J

jet_nguyen


$$ \left\{\begin{array}{1} x^6-x^3+x^2-9y^2-30=28y (1)\\ \sqrt{2x+3}+x=y \end{array}\right.$$ Gợi ý:
$$(1)\Longleftrightarrow x^6+x^2=(y+3)^3+(y+3)$$$$\Longleftrightarrow f(x^2)=f(y+3)$$
 
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