Question

根據(jù)圖形的對(duì)稱性可知，橢圓和雙曲線都有________準(zhǔn)線，對(duì)于中心在原點(diǎn)，焦點(diǎn)在x軸上的橢圓或雙曲線與焦點(diǎn)F₁(－c，0)，F(xiàn)₂(c，0)對(duì)應(yīng)的準(zhǔn)線方程分別為________，________．

Answer 1

答案：兩條 x=-a2/c, x=a2/c,