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深圳市高三期末考试(元月)·理数DA
书书书 !"#$[% 1 &] 2020'()*+%,-."/012 !"#$%&'( 1.【34】A 【56】789,M={x (x+2)(x-5)≤0}={x -2≤x≤5},N={y y=2x}={y y>0},: M∩N= (0,5],:; A. 2.【34】D 【56】789,(1,-2)·(4,λ)=0,< 4-2λ=0,5= λ=2,: n=(4,2),> n 槡= 16+4= 槡25,m 槡= 5,: n m =2,:; D. 3.【34】D 【56】z=1+4i 2-i+i=(1+4i)(2+i) (2-i)(2+i)+i=-2+9i 5 +i=-2+14i 5 ,: 珋z=-2 5-14 5i,:; D. 4.【34】A 【56】789,y′=(3x2-3)·lnx+1 x·(x3-3x),:?@AB k=y′x=1=-2,:CD?@E FG y=-2(x-1),< 2x+y-2=0,:; A. 5.【34】B 【56】789,HI 1JKLMN,OPQRSETUV9WXYZ[NWBG200 500=2 5,: ①]^;K2=(200×30-50×220)2×500 250×250×420×80 ≈5.952,:②],③Q,:; B. 6.【34】B 【56】789,e= 1+m 槡 16=2,5= m=48,_G MF1 - MF2 =2a=8,5= MF2 =18 ` 2,a MF2 ≥c-a=8-4=4,: MF2 =18,bF1 → N=1 2F1 → Mcd,Ne F1MWfg,a Oe F1F2Wfg,: ON =1 2 MF2 =9,:; B. 7.【34】B 【56】ZhiFj,%k-,i=1,S=0+1×21 =2;%,-,i=2,S=2+2×22 =10;%)-,i= 3,S=10+3×23=34;%l-,i=4,S=34+4×24 =98;%m-,i=5,S=98+5×25 =258,no pqr SWs,:; B. 8.【34】D 【56】tuv!w a{ }n WxvG d,> 10a1+45d=95, a1+7d=17{ , 5= a1 =-4,d=3,: an=3n-7,Sn= 3n2-11n 2 ,:; D. 9.【34】C 【56】789,M(0,-1),t?@ l′:y=kx-1,yz x2=4y, y=kx-1{ ,: x2 -4kx+4=0,Δ=16k2 -16 =0,5= k=±1,: x=±2,> N(2,1)` N(-2,1),:{ MNG|}W~WEFG(x+1)2 + y2=2`(x-1)2+y2=2,:; C. !"#$[% 2 &] 10.【34】C 【56】 f(x)=0,= x-4=(x+2)·(2 3)x, x=-2eiEFW,:x-4 x+2=(2 3)x, k|fr y=x-4 x+2,y=(2 3)xWCU,cd, 2 g,<! f(x)=x-4-(x+2)·(2 3)x 2g,:; C. !" # 11.【34】A 【56】_G f(1+x)+f(1-x)=0,:! f(x)WkQfG(1,0),> 1=(2n-1) 4 T, f n∈N ,: 1=(2n-1) 4 ·2π ω,5= ω=(2n-1)π 2 ,n∈N ,cd,; A. 12.【34】B 【56】789=,Ne B1C1Wfg,AB3=216,> AB=6, A1D1|@ MN P, A1B1 |@ MN Q, ¡ AP DD1 E, ¡ AQ BB1 F,r¢£ AFNMECU,> SAFNME =S△AEF +SMNFE,△AEFf,AE=AF 槡=2 13,EF 槡=62,:△AEFW£¤ S=1 2·EF·h= 1 2 槡 槡 槡×62× 34=6 17,l¥¦ MNFEW£¤ S=1 2( 槡 槡3 2+6 2)×槡34 2 = 槡9 17 2 ,:CD¢ ££¤G 槡21 17 2 ,:; B. ! " # $ % & "! #! ' ( )! %! ) * 13.【34】1 21 【56】789,tanα=tan[(2α+β)-(α+β)]=tan(2α+β)-tan(α+β) 1+tan(2α+β)tan(α+β)=1 21. 14.【34】9 【56】ru§¨CTUW©£ª«¬®CU,cd,¯|@ z=-x+y° g Ao,z±²s,yz 2x+y=0, x+y-3=0{ ,5= x=-3, y=6{ , : zW±²sG 9. !"#$[% 3 &] ! " # $ % & 15.【34】289π 9 ! " # $ % &【56】 ¡ AC,BD³ O, ¡ SO,: SO⊥©£ ABCD,> tan∠SAO= SO AO= 槡32 4 ,5= SO=3,´dlµ¶ S-ABCDW·¡¸¸ O′|@ SO ¹,t·¡¸º}G R,> Rt△O′OAf,(3-R)2 +( 槡22)2 =R2,5= R=17 6,:CD·¡¸T£¤ S=4πR2=4π×289 36=289π 9 . 16.【34】21 【56】789,a2 n+1=4a2 n-3,: a2 n+1-1=4a2 n-3-1=4a2 n-4=4(a2 n-1), bn=a2 n-1,C{ bn+1=4bn,C{!w b{ }n eu»!w,¼½G b1 =a2 1 -1=8,x»G 4,C{ bn=b1·4n-1 =8× 22n-2=22n+1,:log2(a2 n-1)=log2bn=log222n+1 =2n+1,: Sn=n(3+2n+1) 2 =n2 +2n, n2 + 2n-440>0,<(n+22)(n-20)>0,C{ n>20` n<-22(¾¿),:CD±ÀsG 21. 17.5:(1)789,sin(A+C) sinC+sinA=c+b-a a-b , sinB sinC+sinA= c a-b-1,(1) bÁÂÃ#= b c+a= c a-b-1,(2) Ä#= b2+c2-a2=-bc,C{ cosA=b2+c2-a2 2bc =-1 2,(4) _G 0<A<π,C{ A=2π 3,(5) :CD·¡~º} r= a 2sinA=槡13 槡3 =槡39 3 .(6) (2)_G a 槡= 13,c=3,A=2π 3, C{bÅÂÃ# a2=b2+c2-2bccosA, = 13=b2+9-2×3×b×cos2π 3,(8) < b2+3b-4=0, 5= b=1` b=-4(¾¿),(10) C{ S=1 2bcsinA=1 2×1×3×槡3 2= 槡33 4 .(12) 18.5:(1)_G CD=2,: AC 槡=22,: SC2+AC2=SA2, > SC⊥AC,(2) a SC⊥MN,MN∥AD,: SC⊥AD, a AC∩AD=A,: SC⊥ ©£ ABCD, !"#$[% 4 &] a BD ©£ ABCD,: SC⊥BD,(4) Æ AC⊥BD,SC∩AC=C,: BD⊥ ©£ SAC, a BD ©£ SBD,:©£ SAC⊥ ©£ SBD.(6) (2){ CGÇg,{ CD,CB,CSC|@G xÈ,yÈ,zÈ,ÉzCUWÊË| ,> B(0,2,0),D(2,0,0),→BD=(2,-2,0),(8) C(0,0,0),M(1,0,1),N(1,1,1), > →CM=(1,0,1),→MN=(0,1,0),t©£ CMNWÌÍ0G n=(x,y,z), b n· →CM=0, n· →MN=0{ ,< x+z=0, y=0{ , z=1,: n=(-1,0,1)G©£ CMNWkÌÍ0, Î|@ BDÏ©£ CMNCÐG θ,: sinθ= →BD·n →BD n =1 2,(11) >|@ BDÏ©£ CMNCÐG30°.(12) ! " # $ % & ' ( ) * + 19.5:(1)789,0.07+0.18+10a+0.25+0.2=1,5= a=0.03.(3) (2)©Ñ!G 25×0.07+35×0.18+45×0.3+55×0.25+65×0.2=48.30.(5) fÒ!G 40+0.5-0.25 0.03 ≈48.33.(7) (3)789,X~B(4,1 4),(8) : P(X=0)=(3 4)4=81 256,P(X=1)=C1 4(1 4)(3 4)3=27 64, P(X=2)=C2 4(1 4)2(3 4)2=27 128,P(X=3)=C3 4(1 4)3(3 4)=3 64, P(X=4)=(1 4)4= 1 256.(10) X 0 1 2 3 4 P 81 256 27 64 27 128 3 64 1 256 : E(X)=4×1 4=1.(12) 20.5:(1)t P(x1,y1),Q(x2,y2),>x2 1 4+y2 1 3=1,x2 2 4+y2 2 3=1, Ó§³Ôc=,(x1+x2)(x1-x2) 4 +(y1+y2)(y1-y2) 3 =0, _G x1+x2=2,y1+y2=槡3 2,>y1-y2 x1-x2 槡=- 3, :|@ lWEFG y-槡3 4 槡=- 3(x-1),< y 槡=- 3x+ 槡53 4 .(5) !"#$[% 5 &] (2)¯|@ lWABÕÖG 0o,t|@ lWEFG y=k(x-1)(k≠0), t M(x0,y0),b y=k(x-1) x2 4+y2 3{ =1׿ y=(4k2+3)x2-8k2x+4k2-12=0, > x1+x2= 8k2 4k2+3,x1x2=4k2-12 4k2+3, C{ x0= 4k2 4k2+3,y0=k(x0-1)= -3k 4k2+3, _G l′WEFG y-y0=-1 k(x-x0), x=0,= t=1 kx0+y0= k 4k2+3= 1 4k+3 k , ¯ k>0o,4k+3 k≥ 槡43,> t∈(0,槡3 12]; ¯ k<0o,4k+3 k≤ 槡-43,> t∈[-槡3 12,0), ¯ lWABÕo, t=0, ع,tWIsÙÚe[-槡3 12,槡3 12].(12) 21.5:(1)789,f′(x)=2xex+x2ex=x(x+2)ex,(1) :¯ x∈[-5,-2)o,f′(x)>0,¯ x∈(-2,-1]o,f′(x)<0,(2) :[f(x)]max=f(-2)=4 e2,(3) a f(-5)=25 e5,f(-1)=1 e,_G25 e5 <1 e,:[f(x)]min=25 e5, :! f(x)[-5,-1]¹W±²sG 4 e2,±ÀsG25 e5.(4) (2) g(x)=x2ex x+1-alnx=0,= x2ex-a(x+1)lnx=0, m(x)=ex-(x+1),QH9Û! x>0,m′(x)=ex-1>0ÜÐz, C{ m(x)=ex-(x+1)>m(0)=0,< ex>x+1>0, > x2ex-a(x+1)lnx>x2(x+1)-a(x+1)lnx=(x+1)(x2-alnx),(7) h(x)=x2-alnx,C{ h′(x)=(x2-alnx)′=2x-a x=2x2-a x , _G 0<a<2e,C{ h′(x)= 2(x+ a 槡2)(x- a 槡2) x , C{ x∈(0, a 槡2)o,h′(x)<0,x∈( a 槡2,+!)o,h′(x)>0, C{ h(x)=x2-alnx(0,+!)¹±Às,(10) C{ h( a 槡2)=a 2-aln a 槡2 =a 2(1-lna 2), _G 0<a 2<e,C{ lna 2<1,C{ 1-lna 2>0, !"#$[% 6 &] C{ a 2(1-lna 2)>0,< 0<a<2eo,QH9 x>0,h(x)=x2-alnx>0, C{ x2ex-a(x+1)lnx>0, :¯ a∈(0,2e)o,! g(x)Ýg.(12) 22.5:(1)789,Þ@ C:(x-2)2+y2=4,< x2+y2-4x=0, : ρ2-4ρcosφ=0,< ρ=4cosφ;(2) |@ l:ρ(cosθ· 1 2+sinθ·槡3 2)=1,> ρcosθ 槡+ 3ρsinθ=2, :|@ l:x 槡+ 3y-2=0.(5) (2)789,|@ l′WßEFG θ=π 6,t M(ρM,π 6),N(ρN,π 6), > ρMcos(π 6-π 3)=1,5= ρM = 槡23 3 , Æ ρN =4cosπ 6 槡=23,: MN = ρM -ρN = 槡43 3 , >g AP|@ l′Wàá d=4×sin(5π 12-π 6)=4×槡2 2 槡=22, :△AMNW£¤G 1 2× 槡43 3 槡×22= 槡46 3 .(10) 23.5:(1)¯ x<-3o,ǧâG -x-3-2x+5>3x,5= x<1 3,: x<-3; ¯ -3≤x≤ 5 2 o,ǧâG x+3+5-2x>3x,5= x<2,: -3≤x<2; ¯ x>5 2 o,ǧâG x+3+2x-5>3x,5= -2>0,Ý5; :u§ f(x)>3xW5ãG(-!,2).(5) (2)7 8 9, x+3 + 2x-5 = x+3 + x-5 2 + x-5 2 ≥ x+3 + x-5 2 ≥ x+3-(x-5 2) =11 2, (¯Öä¯ x=5 2oIuå) :Û! mWIsÙÚG(-!,11 2].(10)查看更多