新高考數(shù)學(xué)一輪復(fù)習(xí)分層提升練習(xí)第41練 橢圓及其性質(zhì)（原卷版）

第41練橢圓及其性質(zhì)（精練）【A組】一、單選題1．橢圓SKIPIF1<0的焦點(diǎn)坐標(biāo)為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<02．已知橢圓SKIPIF1<0的離心率為SKIPIF1<0，則（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<03．已知焦點(diǎn)在SKIPIF1<0軸上的橢圓SKIPIF1<0的焦距為2，則SKIPIF1<0的值為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．5 D．34．如果橢圓SKIPIF1<0上一點(diǎn)SKIPIF1<0到焦點(diǎn)SKIPIF1<0的距離等于6，那么點(diǎn)SKIPIF1<0到另一個(gè)焦點(diǎn)SKIPIF1<0的距離是（

）．A．4 B．14 C．12 D．85．若點(diǎn)SKIPIF1<0滿足方程SKIPIF1<0，則動(dòng)點(diǎn)M的軌跡方程為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<06．已知SKIPIF1<0是橢圓SKIPIF1<0的一個(gè)焦點(diǎn)，則實(shí)數(shù)SKIPIF1<0（

）A．6 B．SKIPIF1<0C．24 D．SKIPIF1<07．已知橢圓SKIPIF1<0的焦點(diǎn)在SKIPIF1<0軸上，則實(shí)數(shù)SKIPIF1<0的取值范圍是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<08．已知橢圓SKIPIF1<0的左?右焦點(diǎn)分別為SKIPIF1<0，點(diǎn)SKIPIF1<0在橢圓SKIPIF1<0上，則SKIPIF1<0的周長為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<09．設(shè)橢圓SKIPIF1<0，SKIPIF1<0的離心率分別為SKIPIF1<0，SKIPIF1<0，若SKIPIF1<0，則SKIPIF1<0（

）A．1 B．2 C．SKIPIF1<0 D．SKIPIF1<010．已知SKIPIF1<0為橢圓SKIPIF1<0的兩個(gè)焦點(diǎn)，過SKIPIF1<0的直線交橢圓于A，B兩點(diǎn)，若SKIPIF1<0，則SKIPIF1<0（

）A．8 B．6 C．4 D．211．直線SKIPIF1<0與橢圓SKIPIF1<0總有公共點(diǎn)，則m的取值范圍是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<012．已知橢圓SKIPIF1<0：SKIPIF1<0的離心率SKIPIF1<0，短軸的右端點(diǎn)為SKIPIF1<0，SKIPIF1<0為線段SKIPIF1<0的中點(diǎn)，則橢圓的標(biāo)準(zhǔn)方程為（

）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<013．橢圓SKIPIF1<0的兩焦點(diǎn)分別為SKIPIF1<0，SKIPIF1<0是橢圓SKIPIF1<0上一點(diǎn)，當(dāng)SKIPIF1<0的面積取得最大值時(shí)，SKIPIF1<0（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<014．已知橢圓E：SKIPIF1<0與直線SKIPIF1<0相交于A，B兩點(diǎn)，O是坐標(biāo)原點(diǎn)，如果SKIPIF1<0是等邊三角形，那么橢圓E的離心率等于（）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<015．我們把由半橢圓SKIPIF1<0與半橢圓SKIPIF1<0合成的曲線稱作“果圓”（其中SKIPIF1<0），如圖所示，

其中點(diǎn)SKIPIF1<0是相應(yīng)橢圓的焦點(diǎn)．若SKIPIF1<0是邊長為1的等邊三角形，則a，b的值分別為（）A．SKIPIF1<0，1 B．SKIPIF1<0，1C．5，3 D．5，416．已知橢圓C的左右焦點(diǎn)分別為SKIPIF1<0，SKIPIF1<0，P，Q為C上兩點(diǎn)，SKIPIF1<0，若SKIPIF1<0，則C的離心率為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<017．已知SKIPIF1<0，SKIPIF1<0分別是橢圓SKIPIF1<0：SKIPIF1<0的左、右焦點(diǎn)，SKIPIF1<0是橢圓SKIPIF1<0在第一象限內(nèi)的一點(diǎn)，若SKIPIF1<0，則SKIPIF1<0（

）A．SKIPIF1<0 B．2 C．SKIPIF1<0 D．SKIPIF1<0二、多選題18．關(guān)于橢圓SKIPIF1<0有以下結(jié)論，其中正確的有（

）A．離心率為SKIPIF1<0 B．長軸長是SKIPIF1<0C．焦距2 D．焦點(diǎn)坐標(biāo)為SKIPIF1<019．已知方程SKIPIF1<0表示橢圓，下列說法正確的是（

）A．m的取值范圍為SKIPIF1<0 B．若該橢圓的焦點(diǎn)在y軸上，則SKIPIF1<0C．若SKIPIF1<0，則該橢圓的焦距為4 D．若SKIPIF1<0，則該橢圓經(jīng)過點(diǎn)SKIPIF1<020．已知SKIPIF1<0是橢圓SKIPIF1<0上一點(diǎn)，SKIPIF1<0是左?右焦點(diǎn)，下列選項(xiàng)中正確的是（

）A．橢圓的焦距為2 B．橢圓的離心率SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<0的面積的最大值是221．已知SKIPIF1<0是橢圓SKIPIF1<0的兩個(gè)焦點(diǎn)，點(diǎn)P在橢圓E上，則（

）A．點(diǎn)SKIPIF1<0在x軸上 B．橢圓E的長軸長為4C．橢圓E的離心率為SKIPIF1<0 D．使得SKIPIF1<0為直角三角形的點(diǎn)P恰有6個(gè)22．已知橢圓SKIPIF1<0，SKIPIF1<0為C的左、右焦點(diǎn)，P為C上一點(diǎn)，且SKIPIF1<0，若SKIPIF1<0交C點(diǎn)于點(diǎn)Q，則（

）A．SKIPIF1<0周長為8 B．SKIPIF1<0C．SKIPIF1<0面積為SKIPIF1<0 D．SKIPIF1<023．設(shè)橢圓SKIPIF1<0的左、右焦點(diǎn)分別為SKIPIF1<0，SKIPIF1<0，SKIPIF1<0是橢圓SKIPIF1<0上的動(dòng)點(diǎn)，則下列結(jié)論正確的是（

）A．以線段SKIPIF1<0為直徑的圓與直線SKIPIF1<0相切B．△SKIPIF1<0面積的最大值為SKIPIF1<0C．SKIPIF1<0D．離心率SKIPIF1<0三、填空題24．寫出一個(gè)焦距為3的橢圓的標(biāo)準(zhǔn)方程：．25．在平面直角坐標(biāo)系中，點(diǎn)SKIPIF1<0到點(diǎn)SKIPIF1<0、SKIPIF1<0的距離之和為SKIPIF1<0，則點(diǎn)SKIPIF1<0的軌跡方程是.26．已知橢圓SKIPIF1<0的離心率為SKIPIF1<0，則長軸與短軸的比值為.27．若橢圓SKIPIF1<0的離心率為SKIPIF1<0，則橢圓SKIPIF1<0的長軸長為.28．已知SKIPIF1<0是橢圓SKIPIF1<0上一點(diǎn)，則離心率SKIPIF1<0.29．橢圓SKIPIF1<0的內(nèi)接正方形的周長為．30．一橢圓的短半軸長是SKIPIF1<0，離心率是SKIPIF1<0，焦點(diǎn)為SKIPIF1<0，弦AB過SKIPIF1<0，則SKIPIF1<0的周長為．31．已知SKIPIF1<0分別是雙曲線SKIPIF1<0的左右焦點(diǎn)，SKIPIF1<0是SKIPIF1<0上的一點(diǎn)，且SKIPIF1<0，則SKIPIF1<0的周長是．32．已知橢圓SKIPIF1<0，SKIPIF1<0是它的右焦點(diǎn)，SKIPIF1<0是它的左頂點(diǎn)，SKIPIF1<0為直線SKIPIF1<0上一點(diǎn)，SKIPIF1<0是底角為SKIPIF1<0的等腰三角形，則SKIPIF1<0的離心率為．33．橢圓SKIPIF1<0的四個(gè)頂點(diǎn)SKIPIF1<0構(gòu)成菱形的內(nèi)切圓恰好過焦點(diǎn)，則橢圓的離心率SKIPIF1<0．34．已知SKIPIF1<0分別為橢圓SKIPIF1<0的左、右焦點(diǎn)，點(diǎn)P在橢圓上，SKIPIF1<0（O為坐標(biāo)原點(diǎn)）是面積為SKIPIF1<0的正三角形，則此橢圓的方程為．35．橢圓的一個(gè)焦點(diǎn)到長軸兩端點(diǎn)的距離之比為SKIPIF1<0，短軸長為8，則橢圓的標(biāo)準(zhǔn)方程為．36．設(shè)SKIPIF1<0和SKIPIF1<0為橢圓SKIPIF1<0的兩個(gè)焦點(diǎn)，點(diǎn)SKIPIF1<0在橢圓上，且滿足SKIPIF1<0，則SKIPIF1<0的面積是.37．已知SKIPIF1<0是等邊三角形，SKIPIF1<0、SKIPIF1<0分別是邊SKIPIF1<0和SKIPIF1<0的中點(diǎn).若橢圓以SKIPIF1<0、SKIPIF1<0為焦點(diǎn)，且經(jīng)過SKIPIF1<0、SKIPIF1<0，則橢圓的離心率等于.38．已知橢圓SKIPIF1<0的左、右兩個(gè)頂點(diǎn)分別為A，B，點(diǎn)P是橢圓C上異于A，B的任意一點(diǎn)，則直線PA，PB的斜率之積為．【B組】一、單選題1．已知橢圓SKIPIF1<0的左，右兩焦點(diǎn)為SKIPIF1<0和SKIPIF1<0，P為橢圓上一點(diǎn)，且SKIPIF1<0，則SKIPIF1<0（

）A．8 B．12 C．16 D．642．已知點(diǎn)SKIPIF1<0，動(dòng)點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離為SKIPIF1<0，則SKIPIF1<0的周長為（

）A．4 B．6 C．SKIPIF1<0 D．SKIPIF1<03．設(shè)橢圓SKIPIF1<0的左、右焦點(diǎn)分別為SKIPIF1<0，SKIPIF1<0，SKIPIF1<0是SKIPIF1<0上的動(dòng)點(diǎn)，則下列四個(gè)結(jié)論正確的個(gè)數(shù)（

）①SKIPIF1<0；②離心率SKIPIF1<0；③SKIPIF1<0面積的最大值為SKIPIF1<0；④以線段SKIPIF1<0為直徑的圓與直線SKIPIF1<0相切．A．1 B．2 C．3 D．44．已知橢圓SKIPIF1<0的右焦點(diǎn)為SKIPIF1<0，過點(diǎn)SKIPIF1<0的直線交橢圓于SKIPIF1<0兩點(diǎn)，若SKIPIF1<0，且SKIPIF1<0，則SKIPIF1<0的方程為（

）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<05．已知點(diǎn)SKIPIF1<0，SKIPIF1<0是橢圓SKIPIF1<0上關(guān)于原點(diǎn)對稱的兩點(diǎn)，SKIPIF1<0，SKIPIF1<0分別是橢圓SKIPIF1<0的左、右焦點(diǎn)，若SKIPIF1<0，則SKIPIF1<0（

）A．1 B．2 C．4 D．56．已知橢圓SKIPIF1<0的右焦點(diǎn)為SKIPIF1<0，過原點(diǎn)的直線SKIPIF1<0與SKIPIF1<0交于SKIPIF1<0兩點(diǎn)，若SKIPIF1<0，且SKIPIF1<0，則SKIPIF1<0的離心率為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<07．已知橢圓E：SKIPIF1<0的右焦點(diǎn)為SKIPIF1<0，左頂點(diǎn)為SKIPIF1<0，若E上的點(diǎn)P滿足SKIPIF1<0軸，SKIPIF1<0，則E的離心率為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<08．橢圓SKIPIF1<0的左右焦點(diǎn)為SKIPIF1<0，SKIPIF1<0，點(diǎn)P為橢圓上不在坐標(biāo)軸上的一點(diǎn)，點(diǎn)M，N滿足SKIPIF1<0，SKIPIF1<0，若四邊形SKIPIF1<0的周長等于SKIPIF1<0，則橢圓C的離心率為SKIPIF1<0（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<09．設(shè)點(diǎn)SKIPIF1<0、SKIPIF1<0分別是橢圓SKIPIF1<0的左、右焦點(diǎn)，點(diǎn)SKIPIF1<0、SKIPIF1<0在SKIPIF1<0上（SKIPIF1<0位于第一象限）且點(diǎn)SKIPIF1<0、SKIPIF1<0關(guān)于原點(diǎn)對稱，若SKIPIF1<0，SKIPIF1<0，則SKIPIF1<0的離心率為（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<0二、多選題10．已知SKIPIF1<0，SKIPIF1<0是橢圓SKIPIF1<0的左、右焦點(diǎn)，點(diǎn)SKIPIF1<0是橢圓上任意一點(diǎn)，則下列說法正確的是（

）A．SKIPIF1<0B．橢圓的焦距為SKIPIF1<0C．點(diǎn)SKIPIF1<0到左焦點(diǎn)SKIPIF1<0距離的最大值為SKIPIF1<0D．SKIPIF1<0的最大值為SKIPIF1<011．已知橢圓SKIPIF1<0，若SKIPIF1<0在橢圓SKIPIF1<0上，SKIPIF1<0是橢圓SKIPIF1<0的左、右焦點(diǎn)，則下列說法正確的有（

）A．若SKIPIF1<0，則SKIPIF1<0 B．SKIPIF1<0面積的最大值為SKIPIF1<0C．SKIPIF1<0的最大值為SKIPIF1<0 D．滿足SKIPIF1<0是直角三角形的點(diǎn)SKIPIF1<0有SKIPIF1<0個(gè)12．已知橢圓SKIPIF1<0的左、右焦點(diǎn)分別為SKIPIF1<0，點(diǎn)SKIPIF1<0在SKIPIF1<0上，且SKIPIF1<0的最大值為3，最小值為1，則（

）A．橢圓SKIPIF1<0的離心率為SKIPIF1<0 B．SKIPIF1<0的周長為4C．若SKIPIF1<0，則SKIPIF1<0的面積為3 D．若SKIPIF1<0，則SKIPIF1<013．SKIPIF1<0，SKIPIF1<0為橢圓SKIPIF1<0的兩個(gè)焦點(diǎn)，橢圓SKIPIF1<0上存在點(diǎn)SKIPIF1<0，使得SKIPIF1<0，則橢圓SKIPIF1<0的方程可以是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<014．設(shè)點(diǎn)SKIPIF1<0，SKIPIF1<0，SKIPIF1<0的坐標(biāo)分別為SKIPIF1<0，SKIPIF1<0，SKIPIF1<0，動(dòng)點(diǎn)SKIPIF1<0滿足：SKIPIF1<0，給出下列四個(gè)命題：①點(diǎn)SKIPIF1<0的軌跡方程為SKIPIF1<0；②SKIPIF1<0；③存在4個(gè)點(diǎn)SKIPIF1<0，使得SKIPIF1<0的面積為SKIPIF1<0；④SKIPIF1<0.則正確命題的有（

）A．① B．② C．③ D．④15．已知SKIPIF1<0，SKIPIF1<0分別是橢圓C：SKIPIF1<0的左、右焦點(diǎn)，P是橢圓C上一點(diǎn)，則（

）A．當(dāng)SKIPIF1<0時(shí)，滿足SKIPIF1<0的點(diǎn)P有2個(gè)B．SKIPIF1<0的周長一定小于SKIPIF1<0C．SKIPIF1<0的面積可以大于SKIPIF1<0D．若SKIPIF1<0恒成立，則C的離心率的取值范圍是SKIPIF1<016．已知橢圓SKIPIF1<0：SKIPIF1<0（SKIPIF1<0），SKIPIF1<0，SKIPIF1<0分別為其左、右焦點(diǎn)，橢圓SKIPIF1<0的離心率為SKIPIF1<0，點(diǎn)SKIPIF1<0在橢圓上，點(diǎn)SKIPIF1<0在橢圓內(nèi)部，則以下說法正確的是（

）A．離心率SKIPIF1<0的取值范圍為SKIPIF1<0B．不存在點(diǎn)SKIPIF1<0，使得SKIPIF1<0C．當(dāng)SKIPIF1<0時(shí)，SKIPIF1<0的最大值為SKIPIF1<0D．SKIPIF1<0的最小值為117．已知雙曲線SKIPIF1<0的焦點(diǎn)分別為SKIPIF1<0，則下列結(jié)論正確的是（

）A．漸近線方程為SKIPIF1<0B．雙曲線SKIPIF1<0與橢圓SKIPIF1<0的離心率互為倒數(shù)C．若雙曲線SKIPIF1<0上一點(diǎn)SKIPIF1<0滿足SKIPIF1<0，則SKIPIF1<0的周長為28D．若從雙曲線SKIPIF1<0的左?右支上任取一點(diǎn)，則這兩點(diǎn)的最短距離為6三、填空題18．過點(diǎn)SKIPIF1<0且與橢圓SKIPIF1<0有相同焦點(diǎn)的橢圓的標(biāo)準(zhǔn)方程為.19．已知橢圓SKIPIF1<0的左、右焦點(diǎn)分別為F1，F(xiàn)2，點(diǎn)P在橢圓上，若線段PF1的中點(diǎn)在y軸上，|PF1|－|PF2|＝.20．設(shè)P是橢圓SKIPIF1<0上任意一點(diǎn)，F(xiàn)為C的右焦點(diǎn)，SKIPIF1<0的最小值為SKIPIF1<0，則橢圓C的長軸長為．21．已知橢圓的焦距不小于短軸長，則橢圓的離心率的取值范圍為．22．已知SKIPIF1<0，SKIPIF1<0為橢圓SKIPIF1<0：SKIPIF1<0的兩個(gè)焦點(diǎn)，P，Q為C上關(guān)于坐標(biāo)原點(diǎn)對稱的兩點(diǎn)，且SKIPIF1<0，則四邊形SKIPIF1<0的面積為．23．已知橢圓SKIPIF1<0的右焦點(diǎn)為SKIPIF1<0，過原點(diǎn)SKIPIF1<0的直線與橢圓SKIPIF1<0交于SKIPIF1<0、SKIPIF1<0兩點(diǎn)，則SKIPIF1<0的最小值為．24．已知橢圓SKIPIF1<0的方程為SKIPIF1<0分別為其左右焦點(diǎn)，SKIPIF1<0兩點(diǎn)在橢圓上，且滿足SKIPIF1<0，若直線SKIPIF1<0的傾斜角為SKIPIF1<0，且四邊形SKIPIF1<0的面積為SKIPIF1<0，則橢圓SKIPIF1<0的離心率為．25．已知橢圓SKIPIF1<0的左、右焦點(diǎn)分別為SKIPIF1<0，SKIPIF1<0，點(diǎn)SKIPIF1<0為SKIPIF1<0上關(guān)于坐標(biāo)原點(diǎn)對稱的兩點(diǎn)，且SKIPIF1<0，且四邊形SKIPIF1<0的面積為SKIPIF1<0，則SKIPIF1<0的離心率為．26．已知SKIPIF1<0是橢圓SKIPIF1<0的左，右焦點(diǎn)，SKIPIF1<0是橢圓上任意一點(diǎn)，過SKIPIF1<0引SKIPIF1<0的外角平分線的垂線，垂足為SKIPIF1<0，則SKIPIF1<0與短軸端點(diǎn)的最近距離為.27．設(shè)SKIPIF1<0，SKIPIF1<0分別是橢圓SKIPIF1<0的左，右焦點(diǎn)，過點(diǎn)SKIPIF1<0的直線交橢圓SKIPIF1<0于SKIPIF1<0，SKIPIF1<0兩點(diǎn)，若SKIPIF1<0，且SKIPIF1<0，則橢圓SKIPIF1<0的離心率為.【C組

維】一、單選題1．已知SKIPIF1<0為坐標(biāo)原點(diǎn)，橢圓SKIPIF1<0：SKIPIF1<0，平行四邊形SKIPIF1<0的三個(gè)頂點(diǎn)A，SKIPIF1<0，SKIPIF1<0在橢圓SKIPIF1<0上，若直線SKIPIF1<0和SKIPIF1<0的斜率乘積為SKIPIF1<0，四邊形SKIPIF1<0的面積為SKIPIF1<0，則橢圓SKIPIF1<0的方程為（

）A．SKIPIF1<0 B．SKIPIF1<0C．SKIPIF1<0 D．SKIPIF1<02．已知橢圓SKIPIF1<0，SKIPIF1<0為兩個(gè)焦點(diǎn)，O為原點(diǎn)，P為橢圓上一點(diǎn)，SKIPIF1<0，則SKIPIF1<0（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<03．設(shè)橢圓SKIPIF1<0（SKIPIF1<0）的右焦點(diǎn)為F，橢圓C上的兩點(diǎn)A、B關(guān)于原點(diǎn)對稱，且滿足SKIPIF1<0，SKIPIF1<0，則橢圓C的離心率的取值范圍是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<04．若橢圓SKIPIF1<0上存在一點(diǎn)SKIPIF1<0，使得函數(shù)SKIPIF1<0圖象上任意一點(diǎn)關(guān)于點(diǎn)SKIPIF1<0的對稱點(diǎn)仍在SKIPIF1<0的圖象上，且橢圓SKIPIF1<0的長軸長大于2，則SKIPIF1<0的離心率的取值范圍是（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<05．橢圓SKIPIF1<0的內(nèi)接四邊形SKIPIF1<0的對角線SKIPIF1<0交于點(diǎn)SKIPIF1<0，滿足SKIPIF1<0，SKIPIF1<0，若直線SKIPIF1<0的斜率為SKIPIF1<0，則橢圓的離心率等于（

）A．SKIPIF1<0 B．SKIPIF1<0 C．SKIPIF1<0 D．SKIPIF1<06．動(dòng)點(diǎn)SKIPIF1<0分別到兩定點(diǎn)SKIPIF1<0連線的斜率的乘積為SKIPIF1<0，設(shè)SKIPIF1<0的軌跡為曲線SKIPIF1<0分別為曲線SKIPIF1<0的左?右焦點(diǎn)，則下列命題中錯(cuò)誤是（

）A．曲線SKIPIF1<0的焦點(diǎn)坐標(biāo)為SKIPIF1<0B．若SKIPIF1<0，則SKIPIF1<0C．SKIPIF1<0的內(nèi)切圓的面積的最大值為SKIPIF1<0D．設(shè)SKIPIF1<0，則SKIPIF1<0的最小值為SKIPIF1<0二、多選題7．已知正方形SKIPIF1<0中，SKIPIF1<0，SKIPIF1<0是平面SKIPIF1<0外一點(diǎn).設(shè)直線SKIPIF1<0與平面SKIPIF1<0所成角為SKIPIF1<0，設(shè)三棱錐SKIPIF1<0的體積為SKIPIF1<0，則下列命題正確的是（

）A．若SKIPIF1<0，則SKIPIF1<0的最大值是SKIPIF1<0B．若SKIPIF1<0，則SKIPIF1<0的最大值是SKIPIF1<0C．若SKIPIF1<0，則SKIPIF1<0的最大值是SKIPIF1<0D．若SKIPIF1<0，則SKIPIF1<0的最大值是SKIPIF1<08．已知橢圓SKIPIF1<0的短軸長為2，上頂點(diǎn)為A，左頂點(diǎn)為B，SKIPIF1<0，SKIPIF1<0分別是橢圓的左、右焦點(diǎn)