- .
- , .
- .
- .
- , .
- , .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- . .
- .
- .
- , , .
- . .
- .
- () .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- .
- . , .
- .
- .
- .
- .
- .
- .
- .
- .
- , .
- .
- .
- , .
- , .
- , .
1. ( ).
). ; ). ;
). ; ). ; ). .
.
). . =3 . x2 + bx + c = (x x1)(x x2), 1 2 , ( 3). 3, , ( 3) 3. : .
). . . 2 (2 0 ). : = = ( ).
). [¥ - ¥] =
|
|
). . =0 . . :
= = .
). . I, 7+3 ¥. [ ]. . I . = =
= .
f(x) = , x = 0.
2.
y=f(x) . , . :
.
= 2 + 1, = 2, = 3 , , , .. 1 = 1 2 = 2.
, .
1 = 1 :
, ,
. , 1 = 1 . 2 = 2 :
, ,
, ,
.. 1- .
c u.
1. (xn) ′ = n xn 1 (un) ′x = n un 1 u′x
2. ()′ = ()′x =
3. = x =
4. (ex) ′ = ex (eu) ′x = eu u′x
5. (ax) ′ = ax lna (au) ′x = au ln a u′x
6. (ln x) ′ = (ln u) ′x =
7. (loga x) ′ = (loga u)x =
8. (sin x) ′ = cos x (sin x) ′x = cos u u′x
9. (cos x) ′ = - sin x (cos x) ′x = - sin u u′x
10. (tg x) ′ = (tg u) ′ x =
11. (ctg x)` = (ctg u) ′x =
12. ( arcsin x) ′ = (arcsin u)`x =
13. ( arcos x) ′ = (arccos u) ′x =
14. (arctg x) ′ = (arctg u) ′x =
15. (arcctg x) ′ = (arcctg u) ′x =
3. :
) ; ) = ; ) ;
) y = xx; ) + - + =0.
.
) , :
. : =6 + 1; = . : .
) :
. . . : .
. : . : . .
) , : . , : .
) ln y = x ln x. , ln y : (ln y) ′ = = ln x + . :
y′ = y [ ln x + 1 ] = = xx [ ln x + 1 ].
) , , : ∙ ′ - - + + ′ =0, .
5.
|
|
:
- .
.
1) D(f) = (0,1) (1,+ ), = 1 - .
2) , .
3) .
, .. = 1 - .
, .. , .
4) .
ln x1= 0 x = e - , D(f) 3 . , f′ (x)
x | (0,1) | (1,e) | e | (e,+ ) |
y | min | |||
y′ | - | - | + |
(0, 1) y′(e-1) = - 2 < 0 y - ;
(1, e) y′(e1/2) = -2 < 0 y - ;
(e, + ) y′(e2) =1/2 > 0 y .
5) .
y′′ = (-ln x + 2)/ x ln3 x = 0 ln x = 2 x = e2 , D(f) 3 . , f′′(x) .
x | (0,1) | (1,e) | e2 | (e2,+ ) |
y | .. e2/2 | |||
y′′ | - | + | - |
(0, 1) y ′′(1/ e) = -3e < 0 y - ;
(1, e2) y ′′(e) = e-1 > 0 y - ;
(e2,+ ) y ′′(e3) = -1/27e-3 < 0 y - .
6) .
7) :
; ; ;
8)