Bài 1:Cho M = $\sqrt[3]{22+10\sqrt{7}}+\sqrt[3]{22-10\sqrt{7}}$
Tìm xy để $4(x^{4}+x^{2}+1)=(x^{4}+2x^{2}+1)(M+2y-y^{2})$
Bài 2: Giải hệ:
$\left\{\begin{matrix} \frac{1}{x}+\frac{1}{y}=\frac{3}{2} & & & & & \\ \frac{1}{z}+\frac{1}{t}=\frac{-2}{3} & & & & & \\ x+y+z+t=5 & & & & & \\ xyzt=-6 & & & & & \end{matrix}\right.$
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