吴忠市2025届高三学业水平适应性测试卷数学参考答案8540..题号12345678答案DCBABCAC3618..60.题号91011答案ACDABDABD3515.2337m212.13.0,114.7,25;3288577..15.(本题满分13分,第(1)题5分,第(2)题8分)解:(1)在第4秒末移动到点2,2,0,需要沿x轴正方向移动2次,沿轴正方向移动次,共有2种可能,分y2C46..........................................................2411故该质点在第4秒末移动到点2,2,0的概率为6.................................3分6216(2)质点移动2次,共有6636种可能.若向正方向移动2次,则X2,有339种91可能,PX2;..........................................................2分36491若向负方向移动2次,则X2,有339种可能,PX2;..........2分364若向正方向和负方向各移动1次,181则X0,有6318种可能,PX0.............................2分362111故EX2200.............................2分44216.(本题满分15分,第(1)题6分,第(2)题9分)解:()当时,,即;分1n11a1S12a12............................1数学答案·第1页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}当n2时,有n1nn,nanSnSn1n122n222n2n得an2,...........................3分若,则;分n1a12............................1n综上,有an2.............................1分1111()分2bnn2nn.............................222n24111111Tn2222n4424nnn11111122444111,............................2分11nn113234243显然,T,有T0,............................1分141174当n2时,TT,且T,有T1(n2),................2分n216n3nnTi011n1故i11..........................2分nnn17.(本题满分15分,第(1)题5分,第(2)题10分)解:(1)如图,取PA的中点F,连接EF,............................1分1BF,有EF∥AD,EFAD,21又BC∥AD,BCAD,2所以EF∥BC,EFBC,所以四边形BCEF是平行四边形,所以CE∥BF,............................2分因为CE平面PAB,BF⊆平面PAB,所以CE⊈∥平面PAB.............................2分数学答案·第2页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}(2)如图,取AD的中点O,连接OP,OB,因为PAPD,APD90,1所以ADPO,POAD1,2由BC∥OD,BCODCD1,CDOD,知四边形BCDO是正方形,有ADBO,OB1,因为POBOO,所以AD平面PBO,因为AD⊆平面ABCD,所以平面ABCD平面PBO,在平面PBO内作直线BO的垂线Oz,则Oz平面ABCD,有OzOB,OzOD,分别以OB,OD,Oz所在直线为x轴、y轴、z轴,建立空间直角坐标系,............................3分因为BC∥AD,所以BC平面PBO,因为BP⊆平面PBO,所以BCBP,由PC2,BC1,知BP3,OP2OB2BP211312由cosBOP,知BOP,2OPOB21123从而有13,分P,0,...........................222A0,1,0,B1,0,0,C1,1,0,有13,,,PA,1,AB1,1,0BC0,1,02213mPA0,xyz0,设平面PAB的法向量为mx,y,z,由有22取x1,mAB0,xy0,则y1,z3,得平面PAB的一个法向量为m1,1,3,......3分BCm5设直线BC与平面PAB所成的角为,则sin......2分BCm5数学答案·第3页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}18.(本题满分17分,第(1)题3分,第(2)题(ⅰ)8分,(ⅱ)6分)c3解:(1)由题意,有,..........................1分a32b4,..............................1分a2b2c2,解得a26,b24,x2y2故椭圆C的方程为1............................1分64x2y2(2)l:ykx1(k0),与1联立,64得23k2x26kx90,...........................1分2其中6k423k29722k210,...........................1分6k设Px,y,Qx,y,有xx,...........................1分11221223k29xx............................1分1223k21(ⅰ)由F,0,E(0,1),QEFP,k有1,即1,分0x2x1x1x2...........................1kk6k1有,...........................1分23k2k6解得k............................2分3(ⅱ)A0,2,B0,2,假设存在直线AP平行于直线BQ,y2y2有,有12,又,,kAPkBQy1kx11y2kx21x1x2kx1kx3有12,得,kx11x2kx23x1x1x2有,分x23x1...........................26k3k代入xx,得x,...........................1分1223k2123k2数学答案·第4页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}9k有x,...........................1分223k293k9k9代入xx,有,...........................1分1223k223k223k223k23k2整理,得1,有20,显然矛盾,故不存在................1分23k2实数k,使直线AP平行于直线BQ.19.(本题满分17分,第(1)题4分,第(2)题(ⅰ)5分,(ⅱ)8分)22解:(1)由题意,有13,得,分1a2.................1a2x2x2有y21,有y1,.................1分4412xx则y'4,.................1分x2x22141441331有,故该函数在点处的切线方程为,y'x11,yx1232223即x23y40..................1分ab(2)因为y是x的“1型函数”,所以1,.................1分xyab由1,1,有xa,yb..................1分xyabbxaybxay2(ⅰ)xyxyabab2ab,xyyxyxabbxay当且仅当1,xyyx即xaab,ybab时“”成立..................3分abbx(ⅱ)由1,有y,.................1分xyxannnnbx记xyxf(x)(xa),.................1分xa数学答案·第5页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}n1n1bxabxn1n1bxnxn分f'(x)nxn2n1xaab......2xaxaxa由f'(x)0,得xan1abn,当xa,an1abn时,f'(x)0,f(x)单调递减,........1分当xan1abn,时,f'(x)0,f(x)单调递增,........1分因此,有nn1nnnbaabnn1n1nn1nn1nbf(x)f(aab)aabaab1n1nn1aabaannnnnnnn1nnnn1nn1nn1n1n1n1n1n1n1n1ababababab....................2分nnn1这也就证明了xnynan1bn1(nN).数学答案·第6页共6页{#{QQABCYAEogCgABAAAQgCQQmSCkAQkhECAYgOwAAAsAAACBFABCA=}#}
宁夏吴忠市高三上学期学业水平适应性考试数学答案
2024-11-30
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