$a,b,c,d,e \in R$ thỏa mãn
$a^2=b^3+c^3$
$b^2=c^3+d^3$
$c^2=d^3+e^3$
$d^2=e^3+a^3$
$e^2=a^3+b^3$.
CMR $a=b=c=d=e$
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