1~8
4
32
.
.
1. x0
A. xet2 1dt
B. xln1+t3dt
sinxsint2dt
1cos x
D.
C.
sin3tdt
0
0
0
0
limf(x) 0,
x0
1.
2.
A.
B.
C.
D.
D
f(x)
-1
f (x) 0, f ( x)
| x |
lim
x 0
1
x 0
lim
x0
f (x) 0, f ( x)
x2
x 0
.
.
f(x)
x0
f(x)
x0
lim
x 0
f (x) 0.
| x |
lim
x0
f (x) 0.
x2
2.
B
f (x) 0lim f(x)0lim f (x) 0,lim f (x) 0
x0 x
x0 x
:lim
x0
x2
x0
| x|
lim f (x) 0, lim f ( x) 0
lim f (x) f (0) lim f (x) 0 f (0)
x0
x
x0
x0
x
x0
f (x)
x 0
x 0
B
A.
lim
( x, y )(0,0)
| n (x, y, f (x, y))| 0
x2 y2
| n(x, y, f (x, y))|0
x2 y2
| d (x, y, f (x, y))| 0
x2 y2
| d (x, y, f (x, y))| 0
x2 y2
B.
lim
( x, y )(0,0)
C.
lim
( x, y )(0,0)
D.
lim
( x, y )(0,0)
3.
A
f (x, y)
(0, 0)
. f (0, 0) 0
lim
x0
y0
lim
x0
y0
f (x, y) f (0, 0) f x(0, 0) x f y(0, 0) y
x2 y2
0
f (x, y) f x(0, 0) x f y(0, 0) y
x2 y2
0
n x, y, f (x, y) f x(0, 0)x f y(0, 0) y f (x, y)
nx,y,f(x,y)
lim
( x, y )(0,0)
0
A.
4. R
ar
n1
n
n
r
A. a r
n
n1
B.a r
n
n1
n
n
| r |R
| r |R
C.| r |R
D.| r |R
4.
A
R
a r
n
n1
a r
n
n1
a x
n
n1
n
n
n
n
(R, R)
| r |R .
PA=B
BP=A
PB=A
Bx=0
n
A
P
P
P
Ax=0
B
a x
n
n1
a r
n
n1
A.
5.
A.
B.
C.
D.
5.
A
.
.
B
B.
P1
AP1 B
A BP1 P P1
1
1
A BP. B.
6.
L: xa2yb22c2
1
a1
b1
L: xa3yb32c3
2
a2
c1
b2
c2
ai
ab ,i 1,2,3.
i
ci
i
A. a1
B. a2
C. a3
a2,a3
a1,a3
a1,a2
D. a1,a2,a3
6.
C
L
1
L
2
c1
x a2 = y b2 z c2 t
a1
a2
2
c
2
tb =t
2
1
x
yb
z
x
y b t b =t
z
a2
2
c
2
3
b1
a1
1
c
1
a3
3
c
3
L1 L2
t 2t13t2
3t1(1t)2 3 1,2
2
C.
P(A) P(B) P(C) 1, P(AB) 0
4
A,B,C
12
A.
A,B,C
7.
P( AC) P(BC) 1
3
4
2
3
1
2
B.
C.
5
12
D.
7.
D
P( ABC ) P( ABUC) P( A) P[ A(BUC)]
P( A) P( AB AC)
P( A) P( AB) P( AC) P( ABC)
1 0 1 0 1
4
12
6
P(BAC ) P(BAUC) P(B) P[B( AUC)]
P(B) P(BA) P(BC) P( ABC)
1 0 1 0 1
4
12
6
P(CBA) P(CBUA) P(C) P[CU (BUA)]
P(C) P(CB) P(CA) P( ABC)
1 1 1 0 1
4 12 12
12
P( ABC ABC ABC) P( ABC ) P( ABC ) P( ABC)
1 1 1 5
6 12
6
D
12
8. X1, X2 ,
, Xn
X
P(X 0) P(X 1) 1 ,(x)
2
100
P Xi 55
i1
A.1(1)
B. (1)
C.1(2)
D. (2)
8.
B
EX 1 , DX 1
2
4
100
EXiX
i1
100EX 50. DXi100DX
25
100
i1
5550
5
(1)
2
24
.
100
i1
Xi ~ N (50,25)
100
Xi55
100
PXi 55Pi1
i1
5
B
1
9.lim
x0 ex1
9—14
1
ln(1x)
1
1
9.
lim
ln(1x)
x0 ex1
lim ln(1 x) e x 1
x0(e 1) ln(1x)
x
lim
x0
ln(1x)ex1
x2
1 ex
lim 1x
2x
x0
1
10.
10.
dy
dx
t 2 1
x
yln(t
t21)
dx
d 2 y
2|t 1
dy
1
t t 2 1
1
t
t 2 1
dt
dx
dt
t
t 2 1
1
t
d
dy
dt
dx
dy2
dx2
d dy
dt
dt
dx
dt
12
t
t
t 2 1
t 2 1
3
t
dy2
2
t 1
f (x)
f (x) af (x) f (x) 0(a 0),
f (0) m, f (0) n
11.
0
11.
f (x)dx
2a10
1,2
12a,121
10,20
f (x)dx [ f (x) af (x)]dx
0
0
2f
(1,1)
[ f (x) af (x)] |
0
n am
12.
xy xt 2
f(x,y)e dt
0
12.
fex(xy)2 xxex3y2
y
2
f
xy
2f
13.
f
y=ex3y3x3y 2ex3y2
x
=e+3e 4e.
(1,1)
a
0
1
1
0
a
1
1
1
1
a
0
1
1
0
a
13.
14.
14.
1
1
0
a
1
a
a 1a2
1
1
a
0
0
0
a
1
1
a
0
1
1
1
1
a
0
0 1
1
a
1 1
a
0
0
a
1
1 a
0
a
1
1
0
a
a 1a2
0
a
1 1
0
0
1
a a22
1a44a2.
2
0
a
,
1
a
a
a
0
0
X
a
YsinX
Cov(X,Y)
sin xdx
1
2
f (x)
0
x
2
cov( X ,Y ) EXY EXEY
E( X sin X ) EXE(sin X )
2 xsinx
2
1
1
1
dx 2
2
2
xdx
2
1
2 x sin xdx 0
2
0
2
2(x)d cos x
0
2
x cos x 2 2 cos xdx
20sinx
2
0
0
2
0
15~23
94
.
.