giải hệ phương trình:
a.$\left\{\begin{matrix} x^3+y^3=1 & \\ x^5+y^5=x^2=y^2 & \end{matrix}\right.$
b.$\left\{\begin{matrix} x(x+2)(2x=y)=9 & \\ x^2+4x+y=6 & \end{matrix}\right.$
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