2017年军队院校生长军官招生 士兵高中数学试题(含答案)
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(Ⅱ)∵ -π2<β<0<α<π2,∴0<α-β<π.
@ cos(α-β)=35,A sin(α-β)=45.9999999999999999 (97)
S sinβ=-153,∴cosβ=1132.
T sinα=sin[(α-β)+β]=sin(α-β)cosβ+cos(α-β)sinβ=3635.9999 (127)
@①A 3x2-(p+6)x+12>0B"C x∈RDEF,
∴Δ1=(p+6)2-3×4×12<0,∴ -18<p<6.③ 9999999999 (57)
@②A 12x2+(p-9)x+3>0B"C x∈RDEF,
∴Δ2=(p-9)2-4×3×12<0,∴ -3<p<21.④ 9999999999 (77)
2
XYA Sn=4-n2n+-21 99999999999999999999999 (107) lm Sn<3EF,i 4-n2n+-21 <3,XYA n+2>2n-1,
T n=1,2,3. 99999999999999999999999999 (127)
!"#$%&'()*+ 2, (- 6,)
14.-56;
15.24;
16.2;
17.k+2
w、5+(( 7(, 82/)
18.4567 87
8:∵x2
-x+1=(x-1)2 2
Hale Waihona Puke Baidu
+34
>0,
99999999999999999
(17)
{3x2 +px-6<6(x2 -x+1)①
∴:;<=>.?
.999999999 (37)
3x2 +px-6>-9(x2 -x+1)②
20.4567 127. (Ⅰ)U5V an≠0,-22-n×-12aan+n1=12,.WXYA an+1=12an+21n, 999999 (27)
R=Z[\]^_` 2n+1,A 2n+1an+1=2nan+2. 99999999999 (47) S 2a1=2,a`{2nan}H` 2?bc,2?def<egh,T 2nan=2+(n-1)2=2n, i an=2nn-1.999999999999999999999999999 (67)
21.4567 107. 8:(Ⅰ)n ξ1,ξ27opqUrstursvwl.xyg,PpqBz{|. } ξ2f7~h?: P(ξ2=2)=CC2435×13+CC3435=35, 999999999999999999 (27) P(ξ2=3)=CC2435×23=25, 99999999999999999999 (47) } E(ξ2)=2×35+3×25=24.99999999999999999 (57) (Ⅱ)@5V ξ1f7~h?: P(ξ1 =1)=P(ξ1 =2)=P(ξ1 =3)=15, P(ξ1=4)=45×34×23=25. 999999999999999999 (87) GH P(ξ1≥ξ2)=1-P(ξ1<ξ2)=1-P(ξ1=1,ξ2=2)-P(ξ1=1 2,ξ2=3) =1-15×35-25×25=1285=072.999999999 (107) P(ξ1≥ξ2)=P(ξ1=2,ξ2=2)+P(ξ1=3,ξ2=2 3)+P(ξ1=4,ξ2=2 3) =15×35+15×1+25×1=1285=072. 99999999 (107)
!○"#$%&'()*%+,)-./01"23
!"#$%&'()*+,-./01
23: (1) 45+$6789(85:,;.<=)*.>*?@AB5:,C)D4./
01EF./. (2) >G*?85+HIJK7LMN,OPQRS/,TUVWX(8Y4Z[\
]^,_`OPa^bcdQRS/8./,efghijklQRS/_j/%mn;> GopqrstMN,ui6/
!"#$%&'()*+ 3, (- 6,)
22.4567 127.
8:(Ⅰ)∵f(x)=ax+bsinx,
∴f′(x)=a+bcosx. 9999999999999999999999 (27)
a+12b=0 S@IA:
,99999999999999999 (47)
π3a+槡23b=π3 -槡3
GH@③、④>I:J -3<p<6K,:;<=B"C x∈RLEF.999 (87)
!"#$%&'()*+ 1, (- 6,)
19.4567 127
(Ⅰ)∵ |a-b|=25槡5,∴a2-2a·b+b2=45, 999999999999999 (37) MNO a=(cosα,sinα),b=(cosβ,sinβ)PQR=,A 12-2(cosαcosβ+sinαsinβ)+12=45,∴cos(α-β)=35. 99999999 (67)
(Ⅱ)@ f′(x)=1-2cosx=1,A cosx=0. 9999999999999999 (77)
J x=-π2K,cosx=0,K y1=x+2=-π2+2,y2=x-2sinx=-π2+2,
(3) vw(xy(5+$,9Fz{|}/%~XKQ_j8x/% (($ (8,(8x/%) J、 (( 4/, 36/)
1.C; 2.C; 3.D; 4.A; 5.D; 6.D; 7.B; 8.A; 9.B.
、( (( 4/, 32/)
10.-2; 11.-3; 12.槡2; 13.14;
8A:a=1,b=-2,
K f(x)=x-2sinx.
∴f′(x)=1-2cosx,
J x∈(0,π3)K,f′(x)<0,
J x∈(π3,π2)K,f′(x)>0.
∴J
x=π3K,f(x)A
π 3
-槡3,
i a=1,b=-25V.99999999999999999999 (67)
(Ⅱ)Sn=210 +221 +232 +… +n2n--12 +2nn-1,
12Sn=211 +222 +233 +… +n2n--11 +2nn,99999999999999999 (87)
\=jkA,
( ) 12Sn=1+211
+212
+213
+…
+2n1-1
-2nn =11--121
n
-2nn,