2021
10
2
x
0
.
x 0
t 3
(e 1)dt
x7
(B)
x2 t 3
(e
0
5
.
50
.
.
(C)
.
(D)
.
x6
2x(e 1)
7
x
x2
0
t 3
(e 1)dt
7
x
x 0
(1)
(A)
C.
1)dt
C.
D.
(2)
(A)
(C)
ex 1
f (x)=
x
1, x 0
, x 0 ,
x 0
.
0.
(B)
(D)
.
0.
lim f (x)= lim ex
1
1 f (0)
f (x)
x 0
x0
f (x) f (0)
x0 x
ex
1
x
1
e x 1 x 1
1
x 0
lim
x0 x 2
2
f (0)
2
D.
lim
x0
x 0
=lim
x
0
(3)
f (x) ax b ln x (a 0)
(A) (e,) .
(B) (0,e) .
b
a
(C) (0, 1 ) .
e
f (x) 0
x b
a
(D) ( 1 ,) .
e
f b a b b ln b 0
a
a
a
f (x 1, ex ) x(x 1) 2
f (x, x2 ) 2x2 ln x
df (1,1)
(B) dx dy .
(C) dy .
(D) dy.
f (x) a b
x
A.
A.
f (x) ax bln x 0
ln b 1
a
b e
a
f (x, y)
(4)
(A) dx dy .
C.
f (x 1,ex ) ex f (x 1,ex ) (x 1) 2 2x(x 1)
1
2
f (x, x2 ) 2xf (x, x2 ) 4x ln x 2x
1
2
1
x 0
y 0
x 1
y 1
f1(1,1) f2(1,1) 1
f1(1,1) 2 f2(1,1) 2
f1(1,1) 0
f2(1,1) 1
df (1,1) f1(1,1)dx f2(1,1)dy dy
f (x , x , x ) (x x )2 (x x )2 (x x )2
(5)
1 2 3
1
2
2
3
1
3
(C) 2,1.
(A) 2,0 .
B.
f (x , x , x ) (x x )2 (x x )2 (x x )2 2x 2 2x x 2x x 2x x
(B)1,1.
(D)1, 2.
1 2 3
1
2
2
3
3
1
2
1 2
C.
0
A 1
1
1
2
1
1
1
0
|E A | 1
1
3
0
(6)
A (,,,)
1 2
4
4
3
Bx
x
(A)2 3 4 k1 .
(C)1 2 4 k3 .
D.
r(B) 3
A (1,2 ,3 ,4 )
4
T
1
B= T 0
2 4
T
3
4
B() = T () 1
1
2
3
2
3
T
1
1
2
T
3
x 1 2 3 k4
(7)
1
A 2
1
P
Q
k
0
1
2
1
1
5
1
1
.
D.
2
2 3
1 3
1.
B.
1
2
1
1
1
1 (1)( 3)
1
k
T
1
B = T 1
2
T
3
1
1
(B)1 3 4 k2 .
(D)1 2 3 k4 .
1 ,2 ,3 ,4
Bx 0
k.
4
Bx
P
Q
PAQ
1
(B) 2
3
1
(D) 0
1
0
1
2
0
0
1
1
0
0
0
1
0
0
1
3
0
0
1
1
0
0
2
1
0
0
0 .
1
3
2 .
1
1
3 .
1
0
1
1
3 .
1
0
0
1
0
0
1
1
0
0
0
1
0
1
0
0
0
1
2
0
1
0
1
(A) 0
0
1
(C) 2
3
C.
1
(A,E) 2
1
0
1
2
1
1
5
1
0
0
0
0
1
0
1
0
0 0
0
1
0
1
2
1
3
6
1
2
1
0
1
0
1
0
0 0
0
1
0
1
0
1
3
0
1
2
3
0
1
2
0
0
1
0
0;
1
0
0
0
Λ
Q
1
3
1
Q 0
1
0
0
1
0
1
3 .
1
C.
0 P(B) 1
P(A| B) P(A) .
P(A | B) P(A)
(F, P) ,
1
0
F 0
E
1
0
0
(8)
(A)
(B)
(C)
(D)
1
P 2
3
1
3
0
0
1
0
0
1
2
1
0
0
0
1
0
0
1
0
1
0
0
0
0
1
B
0
1
0
A
P(A| B) P(A)
P(A| B) P(A)
P(A | B) P(A| B)
P(A| A
D.
P(A| B) P(A).
B)
P(A) P(B) .
B) P(A | A
P( A | A
B)
P(A(A B))
P( A
B)
P(A | A
B)
P(A(A
P( A
B))
B)
P( AB)
P( A
B)
P( A)
P( A) P(B) P( AB)
P(B) P( AB)
P(A) P(B) P(AB)
B)
P( A) P(B) P( AB)
N(,;2 ,2;)
1 2 1
D.
2
P( A | A
(9)
(X ,Y )
1
B) P( A | A
,Y )
2 2
1
(X
1 n
1 2
X
Xi
n
i1
Y
( X ,Y )
n n
1 n
ˆ
Yi X Y
n
2 2
i1
3
(A) E(ˆ) D(ˆ)
1
2
.
n
4
(B) E() D()
ˆ
ˆ
1
(C) E(ˆ) D(ˆ)
1
(D) E() D()
ˆ
ˆ
B
2 2 2
1 2
2
.
n
2 2 2
1
1 2
n
2
2
2
2
n
.
.
X ,Y
Y
E(ˆ) E( X Y ) E( X ) E(Y ) 1 2
X
D( ˆ) D(X Y ) D(X ) D(Y ) cov(X ,Y ) 1
(10)
X
P{X 1}
2 2 2
2
1 2
n
P{X 2} P{X 3}
X Y
1
4
(C)
.
1
2
(D)
5
.
2
1
2
3
2
2
1
3
(B)
2
1
3
8
.
(A)
1
.
1
4
A .
L() (
1
13 15
4
1
) (
2
)
)
4
ln L() 3ln(
d ln L()
3
) 5ln(
5
0
2
d
1 1 4
6
(11)
y cos e x
sin 1
e .
2e
dy
dx
x1
1
.
5
A.
30
.
.
B.
.
dy sin e x (e x
1 )
2 x
dx
(12) 5
5
x
x2 9
dx
sin 1
x 1 e .
2e
dy
dx
.
6 .
3
5
.
4
(13)
5
x
dx
32
9 x
x
x2 9
dx
1 3 d (9 x 2 ) 1 5 d (x 2 9)
2 5
2 3
6 .
x2 9
9
x2
y
x sinx (0 x 1)
x
D
x
D
.
5
V ( x sinx)2 dx xsin2xdx x t 1
1
0
1
0
sin2 tdt .
2 0
4
(14)
yt t
y y y 1 t 2 1 t C
y C , y 1 (at +b)
2
2
2
.
.
C
(t 1)(a(t 1) b) t(at 1) t
2at a b t
a 1 , b 1
2
2
y y y 1 t 2 1 t C , C
.
2
2
x3
x
x
1
1 2x
x
2 1
1
1
2
x
2 1 1
x
.
x
x 1
1
2
x
1
1
1
1 x 2
x
2
2
x
1
1
1
1 2
3
x
x
1
1
1
1
1 2x 2
2
x
x
1
1
2
x
1
x3 , 4x3
2
.
X , Y
x3
2
-5.
X
Y
(15)
f (x)
f (x)
-5.
x
1
2
2
x
x
1
1
2x
1
1
x
1
2
x
1
x3
(16)
.
1
5
.
(X,Y)
(0,1)
1
(1,0)
1
(0,0)
3
10
1
5
, XY
4
cov(X ,Y)
1
20
DX
4
1
,DY
(1,1)
3 , X
10
0
1
2
1
1 Y
2
0
1
2
1
1
2
5
1
.
5
.
.
6
.
70
)
1
1 x x ]
10
1
x
(17)(
lim[arctan
x0
1 1
e).
e
(
.
lim arctan
x0
x
1
(1
1
x ) x
2
e;
6
lim arctan
x0
x
e
1
(1
1
1
x ) x ;
2
e
2
1
e
1 1
(
e
e).
2
(18)(
12
)
f (x, y) 2ln x
(1,0)
2
(x 1)2 y2
2x2
1
( , 0)
2
1
.
2
2 ln 2 .
2x2 x 1 y2
x3
0
0
2x2 x 1 y2 0
y 0
1
( , 0)
2
4x 1x3(2x2 x 1 y2 ) x4
'
fx
f'
y
(1, 0)
y
x2
f
''
x
x
2 y
''
f
xy
x3
f '' 1
yy
2
x
1
2
3
(1, 0)
A=3 B=0 C=1
AC B2 3 0
A 0
f (x, y)
(
, 0)
1
2
f (x, y)
(19)(
(1, 0)
2
A=24 B=0 C=4
AC B2 3 0
A 0
1
( , 0)
2
1
2
2 ln 2 .
)
12
x2 y2 1
D
y x
x
e( x y )2
D
(x2 y2 )dxdy.
1 e 2 1 e 1 .
8
1
8
4
2
e( x y ) (x2
y2 )d
D
1
2
2
4 cos 2d er (cos sin )
r 2 dr 2
0
0
2
1
1
4 cos 2der (cossin) r 2dr2
2 0
0
2
2
du (cos sin)2
1
0
2
4 cos 2deu (cossin) udu
0
1
ueu (cossin)2 du
1
1
0
1
1
(cos sin)
te dt
(cos sin)2 ueu (cossin)2
(cos sin)4 0
(cossin)2 t
4 0
7
e(cossin)2
(cos sin)2
1
[e(cossin)2 1]
(cos sin)4
8