\begin{align} &(x^2+\frac{9}{4}y^2+z^2)^3 - (x^2+\frac{9}{80}y^2)z^3 = 0 \\ &((x^2+\frac{9}{4}y^2+z^2) - (x^2+\frac{9}{80}y^2)^\frac{1}{3}z)((x^2+\frac{9}{4}y^2+z^2)^2 + (x^2+\frac{9}{4}y^2+z^2)(x^2+\frac{9}{80}y^2)^\frac{1}{3}z+((x^2+\frac{9}{80}y^2)^\frac{1}{3}z)^2) = 0 \\ &ここで,((x^2+\frac{9}{4}y^2+z^2) - (x^2+\frac{9}{80}y^2)^\frac{1}{3}z) = 0 の方のみを採用して考え行く \\ &((x^2+\frac{9}{4}y^2+z^2) - (x^2+
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