1
1. : ) ; ) .
21 32 + 3 = - 7
1 + 22 33 = 14
- 1 2 + 53 = -18
:
)
:
2 -3 1
D = 1 2 -3 = 2·2·5 + 1·1·(-1) + (-3)·(-3)·(-1) 1·2·(-1) (-3) ·1·5
-1 -1 5
- 2·(-1)·(-3) = 20 1 9 + 2 + 15 6 = 21
D1; D2; D3,
-7 -3 1 2 -7 1 2 -3 -7
D1 = 14 2 -3 = 21; D2 = 1 14 -3 = 42; D3 = 1 2 14 = - 63
-18 -1 5 -1 -18 5 -1 -1 -18
1; 2; 3 :
1 = D1/D = 21/21 = 1; 2 = D2/D = 42/21 = 2; 3 = D3/D = - 63/21 = -3.
, 1 = 1; 2 = 2; 3 = -3
)
( )
2 -3 1 -7
1 2 -3 14 ,
-1 -1 5 - 18 1, :
1 2 -3 14 (-2)
2 -3 1 -7 - 2 - 4 6 - 28
-1 -1 5 - 18 2 -3 1 - 7
0 -7 7 - 35 ô: (-7)
0 1 -1 5
1 2 -3 14
-1 -1 5 - 18
0 1 2 - 4
,
1 2 -3 14
0 1 -1 5 0 1 -1 5
0 1 2 - 4 0 1 2 - 4
0 0 3 -9
1 2 -3 14
0 1 -1 5
0 0 3 -9
1 + 22 33 = 14 1 + 22 9 = 14 1 + 4 9 = 14 1 = 1
2 3 = 5 Þ 2 + 3 = 5 Þ 2 = 2 Þ 2 = 2
33 = -9 3 = - 3 3 = - 3 3 = - 3
, 1 = 1; 2 = 2; 3 = -3
2: .
) lim 72+6+1 ) lim 7 ) lim sin 20x
→∞ 62 →7 2 - 49 →0 tg 7x
:
) lim 72+6+1 = ( ∞/∞,
→∞ 62 )
= lim 72/2 + 6/2 + 1/2 = lim 7 + 6/ + 1/2 = 7 + 0 + 0 = 7
→∞ 62/2 /2 →∞ 6 1/ 6 0 6
) lim 7 = ( 0/0,
→7 2 - 49 )
= lim 7 = lim 1 = 1 = 1
→7 ( 7)(+7) →7 + 7 7+7 14
) lim sin 20x = ( lim sin x = 1)
→0 tg 7x →0 x
|
|
= lim sin 20x = lim sin 20x cos 7x = lim sin 20x lim cos 7x = (lim cos 7x = 1)
→0 sin 7x/cos7x →0 sin 7x →0 sin 7x →0 7x →0 7x
= lim sin 20x 20x 7x = lim sin 20x lim 7x lim 20x = 1·1· 20 = 20
→0 20x sin 7x 7x →0 20x →0 sin 7x →0 7x 7 7
3. ) = 85 + 22 14 222
) y = (x+1)· cos x
) y = x + 7
x 3
) y = (5x2 +2x)7
:
) (xn)' = n(x) n-1
: (u+v)' = u' + v'
(C u)' = C(u)'
' = (85 + 22 14 222)' = 8(5)'+ 2(2)' 14()' (222)' =
= 8·5x4 + 2·2x 14·1 0 = 40x4 + 4x 14
) (u·v)' = u'·v + u·v'
y' = ((x+1)· cos x)' = (x+1)' cosx + (x+1) (cosx)' = cos x + (x+1)(- sin x)
) (u)' = u'·v u·v'
v v2
y' = x + 7 ' = (x+7)'(x 3) (x+7)(x 3)' = 1·(x 3) (x+7)·1 = x3x7 = - 10
x 3 (x 3)2 (x 3)2 (x 3)2 (x 3)2
) (u(v))' = u'·v'
y' = ((5x2 +2x)7) ' = 7(5x2 +2x)6(5x2 +2x) ' = 7 (5x2 +2x)6 (10+2)
4. : y = 3 3 1
:
:
1. ;
2. , , ;
3. , ( )
4. ;
5. , ;
6. , ;
7. , .
, .
.
1) ...
2) : (-) = 3(-) (- )3 1 = - 3 + 3 1 (-) = - ()
(-) = ()
.
3) (0; -1), (0) = -1.
1) : , . lim f(x) = ∞
→ ∞
.
= f(x)
k = lim f(x) = lim 3 3 1 = lim 3 2 1/ = 3 - ∞ - 0 = - ∞
→ ∞ → ∞ → ∞
2) , ' = (3 3 1)' = 3 32
: 3 32 = 0
2 = 1
= 1 ________________________
(-1) = - 3; (1) = 1 - 1 + 1
(-∞; -1) (1; +∞), (-1; +1)
3) , '' = (3 32)' = - 6 '' = 0 → = 0 _______________________
|
|
(0) = - 1 0
4) :
-1 1
5.
)ò (23+92+10)dx ) ò (2x +1)24dx ) ò x sin2x dx
:
) ,
ò (23+92+10)d=2·3+1/(3+1)+92+1/(2+1)+10=2·4/4+93/3+10=4/2+33+10+C
) , .
2+1 = t, dt = d(2x+1) = 2 dx, dx = ½ dt
ò (2x +1)24dx = ò1/2 t24 dt = 1/2· t25/25 = (2x+1)25/50 + C
)
ò u dv = uv - ò v du
ò x sin2x dx = [ x = u sin 2x dx = dv ] = -½x cos 2x - ò(-½cos2x) dx=
dx = du òsin 2xdx = ò dv
-½ cos 2x = v
= -½x cos 2x + ½ ½sin 2x = -½x cos 2x + ¼sin 2x + C
6.
3
∫(x2+2)dx
1
:
-
b b
ò f(x) dx = F(x)ô = F(b) F(a)
a a
3 3
∫(x2+22)dx = (x3/3 + 22x)ô= (33/3 + 22·3) (13/3 + 22·1) = (9 + 66) (0,3 + 22) =
1 1 = 75 22.3 = 52.7
7. , :
=2+4, =6 . .
:
,
2+4 = 6
2+ 2 = 0, 1 = - 2; 2 = 1 .
= 6 = 2+4, .
1 1 1
S = ò((6 x) (x2+4)) dx = ò(2 x x2) dx = (2x x2/2 x3/3)ô= (2·1 12/2 13/3)
-2 -2 -2
- (2·(-2) (-2)2/2 (-2)3/3) = (2 - 0,5 0,3) (- 4 2 +2,7) = 1,2 (-3,3) = 4,5
:
6
-2 0 1 6
: S = 4,5 ..
8.
(13 10) · ' = 20
:
, 1
(13 10)
(13 10) · ' = 20
(13 10) (13 10) , , ' = dy/dx
d/y dx = 20 /(13 10x) ô· dx
dy/y = 20 dx/(13 10x)
ò dy/y = ò 20 dx/(13 10x)
ln y = - 20 ln(13 10x)
y = (13 10)-2 + C -
(0) = 1 :
1 = 13-2 + , = 1 13-2 = 1 1/169 = 168/169
: y = (13 10)-2 + 168/169
2.
1. 11 6 . , ?
:
: m , , n
= m/n
n = 17 m = 2 ,
n = 217 = 17! /(17-2)! = 17!/15! = 16·17 = 272
, 2 6 . n = 6 m = 2
m = 26 = 6!/(6-2)! = 6!/4! = 5·6 = 30
|
|
, = 30/272 = 0,11
2. . . , , 0,7; 0,8; 0,6. , .
:
,
: () = 0,7
: () = 0,8
: () = 0,6
:
_ _
: () = 1 - 0,7 = 0,3
_ _
: () = 1 - 0,8 = 0,2
_ _
: () = 1 - 0,6 = 0,4
, , , , . , .
_ _ _
D = ABC + ABC + ABC
P(D) = 0,7·0,8·0,4 + 0,7·0,2·0,6 + 0,3·0,8·0,6 = 0,224 + 0,084 + 0,144 = 0,452
3. :
0,3 | 0,3 | 3 |
: ) 3; ) ; ) ; ) , ) ; ) .
:
) 1.
3:
3 = 1 (1 + 2) = 1 (0,3+0,3) = 1 0,6 = 0,4
) : (X) = ∑ xi pi
M(X) = 10·0,3 + 15·0,3 + 20·0,4 = 3 + 4,5 + 8 = 15,5
) :
D(X) = ∑ (xi a)2 pi = ()
D(X) = (10 15,5)2·0,3 + (15 15,5)2 ·0,3 + (20 15,5)2 ·0,3 = 30,25·0,3 + 0,25· 0,3 + 20,25·0,4 = 9,075 + 0,075 + 8,1 = 17,25
____
) : σ() = ÖD()
_____
σ() = Ö17,25 = 4,15
) : F(x), , , .
F(x) = P (X < x)
1. < 10, F() = 0
2. 10 < £ 15, F() = 0,3
3. 15 < £ 20, () = 0,3 + 0,3 = 0,6
4. > 20, () = 1
1
0,3
0,3
0 10 15 20 x
) .
0,4
0,3
0 10 15 20 x
2. :
∞
∑ n
n=1 5n-1
:
':
∞
∑ n - , lim an+1 = d,
n=1 n→∞ an
, d < 1:
, d > 1
d = 1 .
an = n > 0, an+1 = n + 1 = n + 1
5n-1 5n-1+1 5n
d = lim (n + 1) 5n-1 = lim 1 + 11 = 1
n→∞ 5n n n→∞ n 5 5
d = 1/5 < 1, .
|
|
3. , , = {x+2: x ÎN, - 4< x £ 7}; B = {3x-2: x ÎN, -1< x £ 4}
() ()
:
= { -1; 0; 1; 2; 3; 4; 5; 6; 7; 8; 9}
( , : = -3 -3+2 = -1, ..)
B = { -2; 1; 4; 7; 10}
: È , ,
È = { -2; -1; 0; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10}
: Ç , ,
Ç = { 1; 4; 7}
.
1. .., .. . .: , 2002.
2. .., .., .. . 1 2. .: 21 , 2002 .
3. .. : . .: , , 2002 .
.
4. .. . .: , 2001 .
5. .. : . .: -, 2003.
6. .. . -.:, 2001 .
7. .. . : . .: , 1999 .
1.