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第05講空間向量及其應(yīng)用(模擬精練+真題演練)1.(2023·內(nèi)蒙古烏蘭察布·??既#┱襟wSKIPIF1<0中,E,F(xiàn)分別是SKIPIF1<0的中點(diǎn),則直線SKIPIF1<0與EF所成角的余弦值是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.(2023·西藏日喀則·統(tǒng)考一模)已知向量SKIPIF1<0,若SKIPIF1<0與SKIPIF1<0垂直,則SKIPIF1<0(
).A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2023·江蘇揚(yáng)州·揚(yáng)州中學(xué)??寄M預(yù)測(cè))定義兩個(gè)向量SKIPIF1<0與SKIPIF1<0的向量積是SKIPIF1<0一個(gè)向量,它的模SKIPIF1<0,它的方向與SKIPIF1<0和SKIPIF1<0同時(shí)垂直,且以SKIPIF1<0的順序符合右手法則(如圖),在棱長(zhǎng)為2的正四面體SKIPIF1<0中,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0. C.SKIPIF1<0 D.SKIPIF1<0
4.(2023·黑龍江哈爾濱·哈師大附中??寄M預(yù)測(cè))如圖,四棱錐SKIPIF1<0中,底面SKIPIF1<0為正方形,SKIPIF1<0是正三角形,SKIPIF1<0,平面SKIPIF1<0平面SKIPIF1<0,則SKIPIF1<0與SKIPIF1<0所成角的余弦值為(
)
A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<05.(2023·云南保山·統(tǒng)考二模)已知正方體SKIPIF1<0,Q為上底面SKIPIF1<0所在平面內(nèi)的動(dòng)點(diǎn),當(dāng)直線SKIPIF1<0與SKIPIF1<0的所成角為45°時(shí),點(diǎn)Q的軌跡為(
)A.圓 B.直線 C.拋物線 D.橢圓6.(2023·江蘇徐州·??寄M預(yù)測(cè))在空間直角坐標(biāo)系中,直線SKIPIF1<0的方程為SKIPIF1<0,空間一點(diǎn)SKIPIF1<0,則點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離為(
)A.SKIPIF1<0 B.1 C.SKIPIF1<0 D.SKIPIF1<07.(2023·貴州畢節(jié)·校考模擬預(yù)測(cè))鐘鼓樓是中國(guó)傳統(tǒng)建筑之一,屬于鐘樓和鼓樓的合稱,是主要用于報(bào)時(shí)的建筑.中國(guó)古代一般建于城市的中心地帶,在現(xiàn)代城市中,也可以常??匆姼接戌姌堑慕ㄖ?如圖,在某市一建筑物樓頂有一頂部逐級(jí)收攏的四面鐘樓,四個(gè)大鐘對(duì)稱分布在四棱柱的四個(gè)側(cè)面(四棱柱看成正四棱柱,鐘面圓心在棱柱側(cè)面中心上),在整點(diǎn)時(shí)刻(在0點(diǎn)至12點(diǎn)中取整數(shù)點(diǎn),含0點(diǎn),不含12點(diǎn)),已知在3點(diǎn)時(shí)和9點(diǎn)時(shí),相鄰兩鐘面上的時(shí)針?biāo)诘膬蓷l直線相互垂直,則在2點(diǎn)時(shí)和8點(diǎn)時(shí),相鄰兩鐘面上的時(shí)針?biāo)诘膬蓷l直線所成的角的余弦值為(
)
A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<08.(2023·江西·校聯(lián)考模擬預(yù)測(cè))在空間直角坐標(biāo)系中,已知SKIPIF1<0,則當(dāng)點(diǎn)SKIPIF1<0到平面SKIPIF1<0的距離最小時(shí),直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<09.(多選題)(2023·福建寧德·??寄M預(yù)測(cè))已知空間單位向量SKIPIF1<0,SKIPIF1<0,SKIPIF1<0兩兩夾角均為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則下列說法中正確的是(
)A.SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0四點(diǎn)可以共面B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<010.(多選題)(2023·海南海口·??寄M預(yù)測(cè))在長(zhǎng)方體SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是線段SKIPIF1<0上(含端點(diǎn))的一動(dòng)點(diǎn),則下列說法正確的是(
)A.該長(zhǎng)方體外接球表面積為SKIPIF1<0 B.三棱錐SKIPIF1<0的體積為定值C.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0 D.SKIPIF1<0的最大值為1
11.(多選題)(2023·福建福州·福建省福州第一中學(xué)??寄M預(yù)測(cè))如圖,在各棱長(zhǎng)均為2的正三棱柱SKIPIF1<0中,SKIPIF1<0分別是SKIPIF1<0的中點(diǎn),設(shè)SKIPIF1<0,SKIPIF1<0,則(
)
A.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0B.SKIPIF1<0,使得SKIPIF1<0平面SKIPIF1<0C.SKIPIF1<0,使得SKIPIF1<0平面SKIPIF1<0D.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0與平面SKIPIF1<0所成角為SKIPIF1<012.(多選題)(2023·海南??凇ずD先A僑中學(xué)校考一模)如圖,在棱長(zhǎng)為1的正方體SKIPIF1<0中,SKIPIF1<0是棱SKIPIF1<0上的動(dòng)點(diǎn),則下列說法正確的是(
)
A.不存在點(diǎn)SKIPIF1<0,使得SKIPIF1<0B.存在點(diǎn)SKIPIF1<0,使得SKIPIF1<0C.對(duì)于任意點(diǎn)SKIPIF1<0,SKIPIF1<0到SKIPIF1<0的距離的取值范圍為SKIPIF1<0D.對(duì)于任意點(diǎn)SKIPIF1<0,SKIPIF1<0都是鈍角三角形
13.(2023·河北·統(tǒng)考模擬預(yù)測(cè))點(diǎn)SKIPIF1<0、SKIPIF1<0分別是正四面體ABCD棱SKIPIF1<0、SKIPIF1<0的中點(diǎn),則SKIPIF1<0.14.(2023·重慶沙坪壩·重慶一中??寄M預(yù)測(cè))在空間直角坐標(biāo)系中,一四面體的四個(gè)頂點(diǎn)坐標(biāo)分別為SKIPIF1<0,則其體積為.15.(2023·北京大興·??既#┤鐖D,在正方體SKIPIF1<0,中,SKIPIF1<0,SKIPIF1<0分別為線段SKIPIF1<0,SKIPIF1<0上的動(dòng)點(diǎn).給出下列四個(gè)結(jié)論:
①存在點(diǎn)SKIPIF1<0,存在點(diǎn)SKIPIF1<0,滿足SKIPIF1<0∥平面SKIPIF1<0;②任意點(diǎn)SKIPIF1<0,存在點(diǎn)SKIPIF1<0,滿足SKIPIF1<0∥平面SKIPIF1<0;③任意點(diǎn)SKIPIF1<0,存在點(diǎn)SKIPIF1<0,滿足SKIPIF1<0;④任意點(diǎn)SKIPIF1<0,存在點(diǎn)SKIPIF1<0,滿足SKIPIF1<0.其中所有正確結(jié)論的序號(hào)是.16.(2023·全國(guó)·模擬預(yù)測(cè))已知長(zhǎng)方體SKIPIF1<0中,SKIPIF1<0,點(diǎn)SKIPIF1<0是線段SKIPIF1<0上靠近點(diǎn)SKIPIF1<0的三等分點(diǎn),記直線SKIPIF1<0的夾角為SKIPIF1<0,直線SKIPIF1<0的夾角為SKIPIF1<0,直線SKIPIF1<0的夾角為SKIPIF1<0,則SKIPIF1<0之間的大小關(guān)系為.(橫線上按照從小到大的順序進(jìn)行書寫)17.(2023·廣東·校聯(lián)考模擬預(yù)測(cè))如圖,在四棱錐SKIPIF1<0中,SKIPIF1<0,四邊形SKIPIF1<0是菱形,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是棱SKIPIF1<0上的中點(diǎn).
(1)求三棱錐SKIPIF1<0的體積;(2)求平面SKIPIF1<0與平面SKIPIF1<0夾角的余弦值.18.(2023·江蘇徐州·??寄M預(yù)測(cè))在三棱臺(tái)SKIPIF1<0中,SKIPIF1<0為SKIPIF1<0中點(diǎn),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.
(1)求證:SKIPIF1<0平面SKIPIF1<0;(2)若SKIPIF1<0,SKIPIF1<0,平面SKIPIF1<0與平面SKIPIF1<0所成二面角大小為SKIPIF1<0,求三棱錐SKIPIF1<0的體積.
19.(2023·寧夏銀川·??寄M預(yù)測(cè))如圖,在四棱錐SKIPIF1<0中,底面SKIPIF1<0是邊長(zhǎng)為2的菱形,SKIPIF1<0,且SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別是SKIPIF1<0,SKIPIF1<0的中點(diǎn),SKIPIF1<0是SKIPIF1<0上一點(diǎn),且SKIPIF1<0.
(1)求證:SKIPIF1<0平面SKIPIF1<0;(2)若SKIPIF1<0,求直線SKIPIF1<0與平面SKIPIF1<0所成角的余弦值.20.(2023·河南·襄城高中校聯(lián)考模擬預(yù)測(cè))如圖,在正四棱臺(tái)SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為棱SKIPIF1<0,SKIPIF1<0的中點(diǎn),棱SKIPIF1<0上存在一點(diǎn)SKIPIF1<0,使得SKIPIF1<0平面SKIPIF1<0.
(1)求SKIPIF1<0;(2)當(dāng)正四棱臺(tái)SKIPIF1<0的體積最大時(shí),求SKIPIF1<0與平面SKIPIF1<0所成角的正弦值.
21.(2023·山東濰坊·三模)如圖,SKIPIF1<0為圓錐的頂點(diǎn),SKIPIF1<0是圓錐底面的圓心,SKIPIF1<0為底面直徑,SKIPIF1<0為底面圓SKIPIF1<0的內(nèi)接正三角形,且邊長(zhǎng)為SKIPIF1<0,點(diǎn)SKIPIF1<0在母線SKIPIF1<0上,且SKIPIF1<0.
(1)求證:直線SKIPIF1<0平面SKIPIF1<0;(2)求證:平面SKIPIF1<0平面SKIPIF1<0;(3)若點(diǎn)SKIPIF1<0為線段SKIPIF1<0上的動(dòng)點(diǎn).當(dāng)直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值最大時(shí),求此時(shí)點(diǎn)SKIPIF1<0到平面SKIPIF1<0的距離..1.(2023?新高考Ⅰ)如圖,在正四棱柱SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0.點(diǎn)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別在棱SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0上,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)證明:SKIPIF1<0;(2)點(diǎn)SKIPIF1<0在棱SKIPIF1<0上,當(dāng)二面角SKIPIF1<0為SKIPIF1<0時(shí),求SKIPIF1<0.2.(2023?新高考Ⅱ)如圖,三棱錐SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0中點(diǎn).(1)證明SKIPIF1<0;(2)點(diǎn)SKIPIF1<0滿足SKIPIF1<0,求二面角SKIPIF1<0的正弦值.3.(2023?北京)如圖,四面體SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0平面SKIPIF1<0.(Ⅰ)求證:SKIPIF1<0平面SKIPIF1<0;(Ⅱ)求二面角SKIPIF1<0的大?。?.(2022?新高考Ⅱ)如圖,SKIPIF1<0是三棱錐SKIPIF1<0的高,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0的中點(diǎn).(1)證明:SKIPIF1<0平面SKIPIF1<0;(2)若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,求二面角SKIPIF1<0的正弦值.5.(2022?北京)如圖,在三棱柱SKIPIF1<0中,側(cè)面SKIPIF1<0為正方形,平面SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別為SKIPIF1<0,SKIPIF1<0的中點(diǎn).(Ⅰ)求證:SKIPIF1<0平面SKIPIF1<0;(Ⅱ)再從條件①、條件②這兩個(gè)條件中選擇一個(gè)作為已知,求直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值.條件①:SKIPIF1<0;條件②:SKIPIF1<0.注:如果選擇條件①和條件②分別解答,按第一個(gè)解答計(jì)分.6.(2022?浙江)如圖,已知SKIPIF1<0和SKIPIF1<0都是直角梯形,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,二面角SKIPIF1<0的平面角為SKIPIF1<0.設(shè)SKIPIF1<0,SKIPIF1<0分別為SKIPIF1<0,SKIPIF1<0的中點(diǎn).(Ⅰ)證明:SKIPIF1<0;(Ⅱ)求直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值.7.(2022?甲卷)在四棱錐SKIPIF1<0中,SKIPIF1<0底面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)證明:SKIPIF1<0;(2)求SKIPIF1<0與平面SKIPIF1<0所成的角的正弦值.8.(2022?新高考Ⅰ)如圖,直三棱柱SKIPIF1<0的體積為4,△SKIPIF1<0的面積為SKIPIF1<0.(1)求SKIPIF1<0到平面SKIPIF1<0的距離;(2)設(shè)SKIPIF1<0為SKIPIF1<0的中點(diǎn),SKIPIF1<0,平面SKIPIF1<0平面SKIPIF1<0,求二面角SKIPIF1<0的正弦值.9.(2022?天津)直三棱柱SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0中點(diǎn),SKIPIF1<0為SKIPIF1<0
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