## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{b^{2}}$ $=$ $-1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $-1$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{a^{2}}$ $=$ $-1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{-1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $z$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $z$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $z$ $=$ $0$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\textcolor{orange}{z}$ $=$ $\textcolor{red}{0}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{a^{2}}$ $=$ $-1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{a^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{a^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $-1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{a^{2}}{c^{2}}$ $=$ $-1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{c}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{-1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{c}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $z$ $=$ $0$

[B].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $-$ $z$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $-$ $z$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $z$ $=$ $0$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\textcolor{orange}{z}$ $=$ $\textcolor{red}{0}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $z$ $=$ $0$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $z$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $z$ $=$ $1$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $-$ $z$ $=$ $0$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\textcolor{orange}{z}$ $=$ $\textcolor{red}{0}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{a^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $-$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $+$ $\frac{z^{2}}{c^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{z}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{c}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{a^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $=$ $1$

[C].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $=$ $0$

[D].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{b^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $x^{2}$ $+$ $2 a y$ $=$ $1$

[B].   $x^{2}$ $+$ $2 a y$ $=$ $0$

[C].   $x^{2}$ $+$ $2 a y^{2}$ $=$ $0$

[D].   $x^{2}$ $-$ $2 a y$ $=$ $0$

$\textcolor{orange}{x}^{\textcolor{yellow}{2}}$ $\textcolor{yellow}{+}$ $\textcolor{yellow}{2} \textcolor{cyan}{a} \textcolor{orange}{y}$ $=$ $\textcolor{red}{0}$

## 选项

[A].   $\frac{x}{a^{2}}$ $+$ $\frac{y}{a^{2}}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $=$ $1$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a}$ $+$ $\frac{y^{2}}{b}$ $=$ $1$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{b^{2}}$ $=$ $1$

[D].   $\frac{x^{2}}{a^{2}}$ $-$ $\frac{y^{2}}{a^{2}}$ $=$ $1$

$\frac{\textcolor{orange}{x}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{a}^{\textcolor{yellow}{2}}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{\textcolor{yellow}{2}}}{\textcolor{cyan}{b}^{\textcolor{yellow}{2}}}$ $=$ $\textcolor{red}{1}$

## 选项

[A].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{a^{2}}$ $=$ $0$

[B].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $+$ $\frac{z^{2}}{b^{2}}$ $=$ $0$

[C].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $1$

[D].   $\frac{x^{2}}{a^{2}}$ $+$ $\frac{y^{2}}{a^{2}}$ $-$ $\frac{z^{2}}{b^{2}}$ $=$ $0$

$\frac{\textcolor{orange}{x}^{2}}{\textcolor{cyan}{a}^{2}}$ $\textcolor{yellow}{+}$ $\frac{\textcolor{orange}{y}^{2}}{\textcolor{cyan}{a}^{2}}$ $\textcolor{yellow}{-}$ $\frac{\textcolor{orange}{z}^{2}}{\textcolor{cyan}{b}^{2}}$ $=$ $\textcolor{red}{0}$