.
1. D (y).
2. , .
y = f (x) D (y) , D (y) f ( x) = f (x), , f ( x) = f (x). , .
3. .
, , .
4. -
, . .
y = f (x), . , .
0 . = 0 y = f (x), 0 ( ).
= k, , = k x + b y = f (x).
k = 0.
5. y'.
6. , . . , D (y) y' .
7. .
1. y = f (x), (a, b) () (a, b), () (a, b).
2. y = f (x), (a, b) () (a, b), () (a, b).
0, D (y), () y = f (x), -
( 0 ; 0 + ) 0 (' 0),
0 ( ' 0) (. 12)
.
, .
3. y = f (x) 0 , , , 0. 0 f' (x) , 0 , f' (x) 0 , .
. 12 |
8. , . . .
9. , , .
|
|
y = f (x) (a, b) (), () , (a, b) (. 13).
. 13 |
D (y), ( ), .
. (a, b) y = f (x) () , (a, b) (). 0, , , 0 .
10. , (, f (x) > 0 f (x) < 0), .
11. .
1. . ?
2. ? .
3. y = f (x) . , ?
4. .
5. ? ?
6. ? .
7. ? ?
8. ? , = ln x , = cos x 2 x .
9. ? .
10. , . .
11. ? ?
12. ?
6
:
1) = (ln2 x + 5 x)10;
2) = (5 cos 3 x + x) tg 3 x;
3) .
. , :
1) = ((ln2 x + 5 x)10) ' = 10 (ln2 x + 5 x)9 (ln2 x + 5 x) ' = 10 (ln2 x +
+ 5 x)9 = 10 (ln2 x + 5 x)9 .
2) =((5 cos 3 x + x) tg 3 x) ' = (5 cos 3 x + x) ' tg 3 x + (5 cos 3 x + x) (tg 3 x) ' =
= (5 cos 3 x ln5 (cos 3 x) ' + 1) tg 3 x + (5 cos 3 x + x) 3 = (5 cos 3 x ln5 sin 3 x 3 + 1) tg 3 x + (5 cos 3 x + x) = (3 ln5 5 cos 3 x sin 3 x +
+ 1) tg 3 x + .
3) = =
= =
= .
: 1) 10 (ln2 x + 5 x)9 ;
2) (3 ln5 5 cos 3 x sin 3 x + 1) tg 3 x + ;
3) .
7
= .
. 1. + 1 0 ( 1), D (y) = .
2. , , D (y) .
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3. .
4. .
= 1 . (1) , (1), ( + 1)2 , , . . , ( + 1)2 +0, , .
, .
, = 1
.
= k x + b
:
k = = = =
= = = = 0,
b = = = =
= = = 1.
, = 1 .
, = 1 .
5. = =
= = = .
6. . y' = 0:
= 0 x = 1.
= 1, , D (y). = 1 D (y). = 1 .
7. = 1 . ' (. 14).
. 14
.
:
( ; 1) | 1 | (1; 1) | (1; ) | ||
y' | + | + | |||
min |
8. = =
= = =
= = .
9. : = 0.
= 2.
= 1, , D (y). = 2 D (y). (. 15).
. 15
.
:
( ; 1) | 1 | (1; 2) | (2; ) | ||
y'' | + | + | |||
1/9 | |||||
10. .
10.1. . = 0,
= 1.
10.2. . = 0, = .
, (1,0), (0,1) .
, D (y).
11. (. 16).
. 16 |