2017年武汉市四调数学答案解析
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)
5000 ×
78 × 100%=1950( ) 200
20.(
8
) 35 t
,2
3
15.5 t;5
6
(1) (2) 10 , 30 t,
(1)
x
y
.
2 x + 3 y = 15.5 5x + 6 y = 35
x = 4, y = 2.5
4t 2 .5 t
(2)
a
,
(10 − a)
,
4a + (10 − a) × 2.5 ≥ 30 ,
( 11. 12. 13. , 14. , 8+( 5)
6
,
3
,
18
)
x 1 − x −1 x −1
, 1 , 2 ,
5 9
.
ABCD BCF
,E
AB
, △CBE
CE
△CFE,
AF.
EAF 70 ,
15. 16. )
60
8 3,
D 90 ,
30 ( P
3
30 ) , ,
ABCD, ABC 45 , C
(
)
A.1.70 1.75
9. , 5 5 ,
B.1.70 1.80
C.1.65 1.75
1,
D.1.65 1.80
,
m, B.0.5 x
3 2
n, C. 0.5
1 x 3 ,
m n (
)
A. 0
10.
D.0.75
2h, 6
y ( x h ) 2+ 3 , B.
3 2
2
h
3 2
6
(
)
A.
C.
3 2
D. 2
,
Δ=0
( −2 k )2 − 4 ( −4 k − 4 ) = 0
k1 = k2 = −2
l: y = −2 x − 2
, (3 )
l
x = −2
y= x+4
y = −2 x − 2
AC
B ( a, a + 4 ) ,
EF//CD
⎛ 1 ⎞ D ⎜ a, a 2 ⎟ , E ( a, −2 a − 2 ) ⎝ 2 ⎠
,P
(m , 3 )
6 ) m
,
AH x
MN
x
G
AH=3,OH=2,MG=
6 ,OG=m m
OA 2 = AH 2 + OH 2 = 13
OM 2 = MG 2 + OG 2 =
OM=OA
36 + m2 2 m
13 =
36 + m2 2 m
m 4 − 13m 2 + 36 = 0
m = ±2或 ± 3
△DFE
⎧ AC = DF ⎪ ⎨∠C = ∠F ⎪ BC = EF ⎩
△ACB≌△DFE(SAS)
AB=DE AB-BD=DE-BD AD=BE
19.(
8
)
5000 ,
, ,
,
A B C D
(1) (2) (3)
,
___________
B
(1) 200 (2) (3) (
C B
200 × 16%=32
A
B
A. B. C. D.
A A A A
B
, ,
B B
B
5.
(a+3)(a
3)
(
)
A . a2 6a+9
6.
B . a 2+ 9 x B.( 1, 4)
( )
C . a2 9
D . a2 6a 9
A( 1,4)
A.(1,4)
7. 6
C.(1, 4)
, , ( )
D.(4, 1)
,
B
8. 15 /m 1.50 2 1.60 3 1.65 2 1.70 3 1.75 4 1.80 1
2 3
22.( (1) (2)
10
)
y=
3 x 2
y=
k x
A
2
k
,
P(m,3)(m 0) OA OM PN
, ,
x PN PM
y=
k (x 0) x
M,
OA
N
OM, PM
(1 )
A (2 , b )
A A A (2)
y=
(2 , 3 )
3 x, 2
b=3
y=
1 2
k , x
k=6
MN x M
(m ,
2016~2017
,
17- 20 21- 22 23 24
( 1.
10 (
, )
3
,
30
)
16
A. 2
2.
B. 4
C. 4
,
D. 8
( )
1 x+2
2
x C. x 0
A. x
3.
B. x x8
Fra Baidu bibliotek( )
2
D. x
2
A . x x7
4. ( )
B.x16 x2
,
C.x16 x2
;
D . ( x 4) 4
, ,
E
D M
E
M
D
N
F P N
C
F
C
A E
B D
A
G
B
H
K
M J F C
P
K
N
G
A
B
H
(1) ΔABN ≌ ΔBCM ⇒ ∠PNB = ∠BMC ⇒ ΔBPN (2)
ΔBCM ⇒ BP ⋅ BM = BN ⋅ BC
MG ⊥ AB , NH ⊥ AB , CK ⊥ AB ,
AB = 2a , ΔAMG
(3)
3(m − 2) 2 ≥0 2m
PN − PM ≥ 0 PM ≤ PN
23.( (1) (2) (3)
10 1, 2, 3,
)
ABCDEF N N N M BC DC
,
,N
M DC ED
,BN
,BM
AN
P BP BM BN BC
M
,M
CM,
ME DE
,AM∥BN, ,
BC EF
ABCDEF
2,
AP
e O
F,
OC BF CF.
BF = CF
BF=CF 1=2 2= BCF= E sin 1= sin E= Rt△OHC
,
12 13
CH=12a,OC=13a, OH=5a
OF=13a,AH=8a Rt△ABH
,tan ABH=
AH 8a 2 = = BH 12a 3
ABCD tan D
, D= ABH
4
10 ≤ a ≤ 10 3
a
,
21.( (1) (2)
8
)
,
ABCD AC
AD
A B C
O
AB
2,
DC
O
E,
BE,sin E
12 , 13
tan D
B H O E 2 F 1
A
C
D
(1) AD
OA
BC
,
H.
e O
OA AD, ABCD BC∥AD OA BC
AB = AC
(2) AO AF BC
,
PMN( NM Q, QM
MN BC, M
) 3(x+1)+4
M N A
AD BC D
PB.
BC 10,CD 3,
( 8 ) , 72 6x+1
Q
7 2
17.(
8
6x+1=3x+3+4 6x-3x=3+4-1 3x=6 x=2
18.(
8
)
,A
D B E
,AC
DF,BC EF, C
F,
AD BE
△ACB
x1 = −2, x2 = 4 x1 < x2
A ( −2,2 ) , B ( 4,8 )
(2)1 2 A A l
, b = 2k + 2 ,
l
x = −2
y = kx + b
y = kx + 2 k + 2
,
1 2 x = kx + 2 k + 2 2
x 2 − 2 kx − 4 k − 4 = 0
AP =
3 3 7 AK = 4 5
24.(
12
) ,
,
y=
1 2 x 2
A ( x 1, y 1) C ( x 2, y 2) ,
x1 x2
x2 2x 8
(1) (2) (3)
x 1 x 2,
A
l
A C l
2,
B D,
AC E DC
,
B EF
y AC
BE F,
l BF
E,
(1 )
x2 − 2 x − 8 = 0
m>0 m=3 PM=1,PN= PN-PM= M A
3 2
1 2
PM ≤ PN
N
( m,
3 m) 2
PN =
3 6 m − 3 , PM = 3 − 2 m
3 6 3m 2 − 12m + 12 3(m − 2) 2 PN − PM = m + − 6 = = 2 m 2m 2m
3(m − 2) 2 ≥ 0,m > 0
1 3 3 3 BH = a , NH = CK = a , MG = 3 AB = 2 3a 2 2 2 2 ME 1 ΔBNH ⇒ AG = a ⇒ = 3 DE 3
MG ⊥ AB , NH ⊥ AB , AJ ⊥ AB , BK ⊥ AB
AK =
AP AJ MG 4 7 , = = = 3, PK BK NH 5
BD BC = BE BF
BC ⋅ BE BF = = BD
( a − 4 )2 + ( a + 4 − 8 )2 ⋅ ⎡ ⎣( a + 4 ) − ( −2 a − 2 ) ⎤ ⎦
a+4− 1 2 x 2
=6 2