范圍：________，這說明該橢圓位于直線________和________所圍成的矩形里．

橢圓＝1(a＞b＞0)的幾何性質(zhì)

(1)范圍：________，這說明該橢圓位于直線________和________所圍成的矩形里．

(2)對(duì)稱性：關(guān)于________對(duì)稱．橢圓的對(duì)稱中心叫做橢圓的________．

(3)頂點(diǎn)：四個(gè)頂點(diǎn)的坐標(biāo)分別為________、________，長(zhǎng)軸的長(zhǎng)是________，短軸的長(zhǎng)是________．

(4)離心率：橢圓的焦距與長(zhǎng)軸長(zhǎng)的比e＝，叫做橢圓的________．其中e∈________．當(dāng)e越接近于1時(shí)，橢圓越________；當(dāng)e越接近于0時(shí)，橢圓越________．