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2025高考数学调研一轮复习学生用书含练习及参考答案
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2.答案 C
3. 答案 B
4. 答案 D
解析 如图,连接AC交BE于G,连接FG,因为PA∥平面EBF,PA⊂平面PAC,平面PAC∩平面BEF=FG,所以PA∥FG,所以eq \f(PF,FC)=eq \f(AG,GC).又AD∥BC,E为AD的中点,所以eq \f(AG,GC)=eq \f(AE,BC)=eq \f(1,2),所以eq \f(PF,FC)=eq \f(1,2).
5. 答案 D
解析 由于B,E,F三点共面,F∈平面BEF,M∉平面BEF,故MF,EB为异面直线,故A错误;由于B1,N,E三点共面,B1∈平面B1NE,A1∉平面B1NE,故A1B1,NE为异面直线,故B错误;∵在平行四边形AA1B1B中,AM=2MA1,BN=2NB1,∴AM∥BN,AM=BN,故四边形AMNB为平行四边形,∴MN綉AB.又MN⊄平面ABC,AB⊂平面ABC,∴MN∥平面ABC.又MN⊂平面MNEF,平面MNEF∩平面ABC=EF,∴MN∥EF,∴EF∥AB,显然在△ABC中,EF≠AB,∴EF≠MN,∴四边形MNEF为梯形,故C错误,D正确.
6.答案 A
解析 如图所示,分别取AC,A1C1,A1B1的中点N,F,M,
连接ME,MF,NE,FN.
又E为AB的中点,所以NE∥BC且NE=eq \f(1,2)BC,
同理FM∥B1C1,且MF=eq \f(1,2)B1C1,所以N,E,M,F四点共面.
因为ME∥BB1,NE∥BC,
易证ME∥平面BCC1B1,NE∥平面BCC1B1,
而NE∩ME=E,所以平面NEMF∥平面BCC1B1,而EF⊂平面NEMF,所以EF∥平面BCC1B1,∵EP∥平面BCC1B1,平面BCC1B1∥平面NEMF,E∈平面NEMF,
∴P∈平面NEMF,又P∈平面ACC1A1,平面NEMF∩平面ACC1A1=NF,
∴P∈NF,
则动点P的轨迹为线段FN.
7. 答案 BC
解析 由题意知,OM是△BPD的中位线,∴OM∥PD,又PD∩PA=P,故A不正确;∵PD⊂平面PCD,OM⊄平面PCD,∴OM∥平面PCD,故B正确;同理,可得OM∥平面PDA,故C正确;OM与平面PBA相交,故D不正确.
8.答案 AD
解析 由于AB固定,所以在倾斜的过程中,始终有CD∥HG∥EF∥AB,且平面AEHD∥平面BFGC,故水的部分始终呈棱柱形(三棱柱或四棱柱),且AB为棱柱的一条侧棱,没有水的部分也始终呈棱柱形,故A正确;对于水面EFGH所在四边形,从图②、图③可以看出,EF,GH长度不变,而EH,FG的长度随倾斜度变化而变化,所以水面EFGH所在四边形的面积是变化的,故B错误;假设A1C1与水面所在的平面始终平行,又C1D1与水面所在的平面始终平行,则长方体上底面A1B1C1D1与水面所在的平面始终平行,这就与倾斜时两个平面不平行矛盾,故C错误;水量不变时,棱柱AEH-BFG的体积是定值,又该棱柱的高AB不变,且VAEH-BFG=eq \f(1,2)·AE·AH·AB,所以AE·AH=eq \f(2VAEH-BFG,AB),即AE·AH是定值,故D正确.
9.答案 平面ABC和平面ABD
解析 如图,连接AM并延长交CD于E,连接BN并延长交CD于F.由重心的性质可知,E,F重合,且为CD的中点.由eq \f(EM,MA)=eq \f(EN,NB)=eq \f(1,2),得MN∥AB.∵AB⊂平面ABD,MN⊄平面ABD,AB⊂平面ABC,MN⊄平面ABC,∴MN∥平面ABC且MN∥平面ABD.
10. 答案 矩形
11. 答案 证明见解析
证明 如图,连接BD交AQ于点M,连接PM,
由四边形ABCD是正方形,
易得△BMQ∽△DMA,因为BQ=eq \f(1,2)AD,所以BM=eq \f(1,2)DM.
又EP=eq \f(1,2)DP,所以PM∥BE.
又PM⊂平面APQ,BE⊄平面APQ,所以BE∥平面APQ.
12. 答案 (1)证明见解析 (2)1∶9
解析 (1)证明:连接BM,BN,BG并延长分别交AC,AD,CD于点P,F,H.
∵M,N,G分别为△ABC,△ABD,△BCD的重心,
∴eq \f(BM,MP)=eq \f(BN,NF)=eq \f(BG,GH)=2.
连接PF,FH,PH,有MN∥PF.
又∵PF⊂平面ACD,MN⊄平面ACD,
∴MN∥平面ACD.
同理可得MG∥平面ACD.
∵MG∩MN=M,
∴平面MNG∥平面ACD.
(2)由(1)可知eq \f(MG,PH)=eq \f(BG,BH)=eq \f(2,3),
∴MG=eq \f(2,3)PH.又∵PH=eq \f(1,2)AD,
∴MG=eq \f(1,3)AD.同理可得NG=eq \f(1,3)AC,MN=eq \f(1,3)CD.
∴△MNG∽△DCA,且相似比为1∶3,
∴S△MNG∶S△ADC=1∶9.
13. 答案 (1)证明见解析 (2)16
解析 (1)证明:因为平面PAB∥平面EFHG,
平面DAB∩平面EFHG=EG,平面DAB∩平面PAB=AB,所以GE∥AB.
因为CD∥AB,所以GE∥CD,
又因为CD⊂平面PDC,EG⊄平面PDC,
所以EG∥平面PDC.
(2)因为AD⊥CD,AB∥CD,所以四边形ABCD为直角梯形,
因为AB=3,AD=CD=6,AB∥GE∥CD,
所以eq \f(AE,EC)=eq \f(AB,CD)=eq \f(1,2),S△CDE=eq \f(2,3)S△ADC=12.
因为平面PAB∥平面EFHG,平面PAD∩平面EFHG=GH,平面PAD∩平面PAB=PA,所以GH∥PA,eq \f(AG,GD)=eq \f(PH,HD)=eq \f(1,2),
因为PD=6,所以HD=eq \f(2,3)PD=4,
因为EG∥平面PDC,EG⊂平面EFHG,平面EFHG∩平面PDC=HF,
所以EG∥HF,所以HF∥DC,易证HF∥平面ABCD,
又PD⊥平面ABCD,所以HD即为F到平面CDE的距离,
所以VF-CDE=eq \f(1,3)S△CDE·HD=16.
14.答案 B
解析 如图,取B1C1的中点M,BB1的中点N,连接A1M,A1N,MN,可以证明平面A1MN∥平面AEF,所以点P位于线段MN上.
因为A1M=A1N=eq \r(1+\b\lc\(\rc\)(\a\vs4\al\c1(\f(1,2)))\s\up12(2))=eq \f(\r(5),2),MN=eq \r(\b\lc\(\rc\)(\a\vs4\al\c1(\f(1,2)))\s\up12(2)+\b\lc\(\rc\)(\a\vs4\al\c1(\f(1,2)))\s\up12(2))=eq \f(\r(2),2),所以当点P位于M或N点时,A1P最大,为eq \f(\r(5),2),当点P位于MN的中点时,A1P最小,此时A1P=eq \r(\b\lc\(\rc\)(\a\vs4\al\c1(\f(\r(5),2)))\s\up12(2)-\b\lc\(\rc\)(\a\vs4\al\c1(\f(\r(2),4)))\s\up12(2))=eq \f(3\r(2),4),所以eq \f(3\r(2),4)≤A1P≤eq \f(\r(5),2),所以线段A1P长度的取值范围是eq \b\lc\[\rc\](\a\vs4\al\c1(\f(3\r(2),4),\f(\r(5),2))).
15. 答案 (1)证明见解析 (2)18
解析 (1)证明:因为BC∥平面GEFH,BC⊂平面PBC,且平面PBC∩平面GEFH=GH,所以GH∥BC.
同理可证EF∥BC,因此GH∥EF.
(2) 如图,连接AC,BD交于点O,设BD交EF于点K,连接OP,GK.
因为PA=PC,O是AC的中点,所以PO⊥AC,同理可得PO⊥BD.
又BD∩AC=O,且AC,BD⊂平面ABCD,所以PO⊥底面ABCD.
又因为平面GEFH⊥平面ABCD,
且PO⊄平面GEFH,所以PO∥平面GEFH,
因为平面PBD∩平面GEFH=GK,
所以PO∥GK,则GK⊥底面ABCD,从而GK⊥EF.
所以GK是梯形GEFH的高,由AB=8,EB=2,得EB∶AB=KB∶DB=1∶4,
从而KB=eq \f(1,4)DB=eq \f(1,2)OB,即K为OB的中点,
再由PO∥GK,得G是PB的中点,GK=eq \f(1,2)PO,
同理GH=eq \f(1,2)BC=4,
由已知可得OB=4eq \r(2),PO=eq \r(PB2-OB2)=eq \r(68-32)=6,所以GK=3,
故四边形GEFH的面积S=eq \f(GH+EF,2)·GK=eq \f(4+8,2)×3=18.
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