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專題16拋物線的焦點(diǎn)弦、中點(diǎn)弦、弦長問題限時(shí):120分鐘滿分:150分一、單選題:本大題共8小題,每個(gè)小題5分,共40分.在每小題給出的選項(xiàng)中,只有一項(xiàng)是符合題目要求的.1.已知拋物線SKIPIF1<0的焦點(diǎn)為SKIPIF1<0,則過點(diǎn)SKIPIF1<0且斜率為SKIPIF1<0的直線SKIPIF1<0截拋物線SKIPIF1<0所得弦長為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.設(shè)SKIPIF1<0為拋物線SKIPIF1<0的焦點(diǎn),過點(diǎn)SKIPIF1<0的直線SKIPIF1<0交SKIPIF1<0于SKIPIF1<0兩點(diǎn),若SKIPIF1<0,則SKIPIF1<0(
)A.8 B.12 C.16 D.243.過拋物線SKIPIF1<0的焦點(diǎn)SKIPIF1<0的直線SKIPIF1<0交SKIPIF1<0于SKIPIF1<0兩點(diǎn),若直線SKIPIF1<0過點(diǎn)SKIPIF1<0,且SKIPIF1<0,則拋物線SKIPIF1<0的準(zhǔn)線方程是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<04.過點(diǎn)SKIPIF1<0作拋物線SKIPIF1<0的弦AB,恰被點(diǎn)Q平分,則弦AB所在直線的方程為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<05.已知直線SKIPIF1<0與拋物線SKIPIF1<0:SKIPIF1<0交于SKIPIF1<0,SKIPIF1<0兩點(diǎn),過SKIPIF1<0,SKIPIF1<0分別作SKIPIF1<0的切線交于點(diǎn)SKIPIF1<0,若SKIPIF1<0的面積為SKIPIF1<0,則SKIPIF1<0(
)A.1 B.SKIPIF1<0 C.SKIPIF1<0 D.26.已知拋物線SKIPIF1<0:SKIPIF1<0的焦點(diǎn)為F,過F且斜率大于零的直線l與SKIPIF1<0及拋物線SKIPIF1<0:SKIPIF1<0的所有公共點(diǎn)從右到左分別為點(diǎn)A,B,C,則SKIPIF1<0(
)A.4 B.6 C.8 D.107.已知斜率為SKIPIF1<0的直線過拋物線C:SKIPIF1<0的焦點(diǎn)F且與拋物線C相交于A,B兩點(diǎn),過A,B分別作該拋物線準(zhǔn)線的垂線,垂足分別為SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0與SKIPIF1<0的面積之比為3,則k的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<08.已知拋物線SKIPIF1<0的焦點(diǎn)SKIPIF1<0與SKIPIF1<0的一個(gè)焦點(diǎn)重合,過焦點(diǎn)SKIPIF1<0的直線與SKIPIF1<0交于SKIPIF1<0,SKIPIF1<0兩不同點(diǎn),拋物線SKIPIF1<0在SKIPIF1<0,SKIPIF1<0兩點(diǎn)處的切線相交于點(diǎn)SKIPIF1<0,且SKIPIF1<0的橫坐標(biāo)為4,則弦長SKIPIF1<0(
)A.16 B.26 C.14 D.24二、多選題:本大題共4小題,每個(gè)小題5分,共20分.在每小題給出的選項(xiàng)中,只有一項(xiàng)或者多項(xiàng)是符合題目要求的.9.已知SKIPIF1<0是拋物線SKIPIF1<0SKIPIF1<0內(nèi)一動(dòng)點(diǎn),直線SKIPIF1<0過點(diǎn)SKIPIF1<0且與拋物線SKIPIF1<0相交于SKIPIF1<0兩點(diǎn),則下列說法正確的是(
)A.SKIPIF1<0時(shí),SKIPIF1<0的最小值為SKIPIF1<0B.SKIPIF1<0的取值范圍是SKIPIF1<0C.當(dāng)點(diǎn)SKIPIF1<0是弦SKIPIF1<0的中點(diǎn)時(shí),直線SKIPIF1<0的斜率為SKIPIF1<0D.當(dāng)點(diǎn)SKIPIF1<0是弦SKIPIF1<0的中點(diǎn)時(shí),SKIPIF1<0軸上存在一定點(diǎn)SKIPIF1<0,都有SKIPIF1<010.已知A,B是拋物線SKIPIF1<0:SKIPIF1<0上兩動(dòng)點(diǎn),SKIPIF1<0為拋物線SKIPIF1<0的焦點(diǎn),則(
)A.直線AB過焦點(diǎn)F時(shí),SKIPIF1<0最小值為4B.直線AB過焦點(diǎn)F且傾斜角為SKIPIF1<0時(shí),SKIPIF1<0C.若AB中點(diǎn)M的橫坐標(biāo)為2,則SKIPIF1<0最大值為5D.SKIPIF1<011.過拋物線SKIPIF1<0上一點(diǎn)SKIPIF1<0作兩條相互垂直的直線,與SKIPIF1<0的另外兩個(gè)交點(diǎn)分別為SKIPIF1<0,則(
)A.SKIPIF1<0的準(zhǔn)線方程是SKIPIF1<0B.過SKIPIF1<0的焦點(diǎn)的最短弦長為2C.直線SKIPIF1<0過定點(diǎn)SKIPIF1<0D.若直線SKIPIF1<0過點(diǎn)SKIPIF1<0,則SKIPIF1<0的面積為2412.已知SKIPIF1<0是拋物線SKIPIF1<0的焦點(diǎn),SKIPIF1<0,SKIPIF1<0是拋物線SKIPIF1<0上的兩點(diǎn),SKIPIF1<0為坐標(biāo)原點(diǎn),則(
)A.拋物線SKIPIF1<0的準(zhǔn)線方程為SKIPIF1<0B.若SKIPIF1<0,則SKIPIF1<0的面積為SKIPIF1<0C.若直線SKIPIF1<0過焦點(diǎn)SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0到直線SKIPIF1<0的距離為SKIPIF1<0D.若SKIPIF1<0,則SKIPIF1<0三、填空題:本大題共4小題,每小題5分,共20分.把答案填在答題卡中的橫線上.13.拋物線SKIPIF1<0截直線SKIPIF1<0所得弦長等于.14.若拋物線SKIPIF1<0的弦被點(diǎn)SKIPIF1<0平分,則此弦所在直線的斜率為.15.已知斜率為SKIPIF1<0的直線過拋物線SKIPIF1<0的焦點(diǎn)SKIPIF1<0,與拋物線SKIPIF1<0交于SKIPIF1<0兩點(diǎn)(SKIPIF1<0在SKIPIF1<0的左側(cè)),又SKIPIF1<0為坐標(biāo)原點(diǎn),點(diǎn)SKIPIF1<0(異于SKIPIF1<0)也為拋物線SKIPIF1<0上一點(diǎn),且SKIPIF1<0,則實(shí)數(shù)SKIPIF1<0的值為.16.已知拋物線SKIPIF1<0的焦點(diǎn)為SKIPIF1<0,準(zhǔn)線與SKIPIF1<0軸的交點(diǎn)為SKIPIF1<0,過點(diǎn)SKIPIF1<0的直線與拋物線交于點(diǎn)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0.四、解答題:本大題共6小題,共70分.解答應(yīng)寫出必要的文字說明、證明過程或演算步驟.17.已知拋物線SKIPIF1<0的焦點(diǎn)為SKIPIF1<0,斜率為SKIPIF1<0的直線SKIPIF1<0與SKIPIF1<0交于SKIPIF1<0兩點(diǎn),與SKIPIF1<0軸交點(diǎn)為P.(1)若SKIPIF1<0,求SKIPIF1<0的方程;(2)若SKIPIF1<0,求SKIPIF1<0.18.已知直線SKIPIF1<0與拋物線SKIPIF1<0相交于SKIPIF1<0、SKIPIF1<0兩點(diǎn).(1)若直線SKIPIF1<0過點(diǎn)SKIPIF1<0,且傾斜角為SKIPIF1<0,求SKIPIF1<0的值;(2)若直線SKIPIF1<0過點(diǎn)SKIPIF1<0,且弦SKIPIF1<0恰被SKIPIF1<0平分,求SKIPIF1<0所在直線的方程.19.已知直線SKIPIF1<0軸,垂足為x軸負(fù)半軸上的點(diǎn)E,點(diǎn)E關(guān)于原點(diǎn)O的對(duì)稱點(diǎn)為F,且SKIPIF1<0,直線SKIPIF1<0,垂足為A,線段AF的垂直平分線與直線SKIPIF1<0交于點(diǎn)B,記點(diǎn)B的軌跡為曲線C.(1)求曲線C的方程;(2)已知點(diǎn)SKIPIF1<0,不過點(diǎn)P的直線l與曲線C交于M,N兩點(diǎn),以線段MN為直徑的圓恒過點(diǎn)P,點(diǎn)P關(guān)于x軸的對(duì)稱點(diǎn)為Q,若SKIPIF1<0的面積是SKIPIF1<0,求直線SKIPIF1<0的斜率.20.設(shè)拋物線C:SKIPIF1<0的焦點(diǎn)為F,P是拋物線外一點(diǎn),直線PA,PB與拋物線C切于A,B兩點(diǎn),過點(diǎn)P的直線交拋物線C于D,E兩點(diǎn),直線AB與DE交于點(diǎn)Q.(1)若AB過焦點(diǎn)F,且SKIPIF1<0,求直線AB的傾斜角;(2)求SKIPIF1<0的值.21.已知SKIPIF1<0是拋物線SKIPIF1<0的焦點(diǎn),過點(diǎn)SKIPIF1<0的直線交拋物線SKIPIF1<0于SKIPIF1<0兩點(diǎn),當(dāng)SKIPIF1<0平行于SKIPIF1<0軸時(shí),SKIPIF1<0.(1)求拋物線SKIPIF1<0的方程;(2)若SKIPIF1<0為坐標(biāo)原點(diǎn),過點(diǎn)SKIPIF1<0作SKIPIF1<0軸的垂線交直線S
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