1. f (x) = 3 x 2 + 4 x 5. f (x) x 0 = 1.
. f (x) x R. :
= (3 x 2 + 4 x 5)′ = 6 x + 4.
f (x 0) = f (1) = 2; (x 0) = = 10. :
y = (x 0) (x x 0) + f (x 0),
y = 10(x 1) + 2,
y = 10 x 8.
. y = 10 x 8.
2. f (x) = x 3 3 x 2 + 2 x + 5. f (x), y = 2 x 11.
. f (x) x R. :
= (x 3 3 x 2 + 2 x + 5)′ = 3 x 2 6 x + 2.
f (x) x 0 y = 2 x 11, 2, . . (x 0) = 2. , 3 x 6 x 0 + 2 = 2. x 0 = 0 x 0 = 2. f (x 0) = 5, y = 2 x + b (0; 5), (2; 5).
5 = 2×0 + b, b = 5, 5 = 2×2 + b, b = 1.
, y = 2 x + 5 y = 2 x + 1 f (x), y = 2 x 11.
. y = 2 x + 5, y = 2 x + 1.
3. f (x) = x 2 6 x + 7. f (x), A (2; 5).
. f (2) 5, A f (x). x 0 .
f (x) x R. :
= (x 2 6 x + 1)′ = 2 x 6.
f (x 0) = x 6 x 0 + 7; (x 0) = 2 x 0 6. :
y = (2 x 0 6)(x x 0) + x 6 x + 7,
y = (2 x 0 6) x x + 7.
A ,
5 = (2 x 0 6)×2 x + 7,
x 0 = 0 x 0 = 4. , A f (x).
x 0 = 0, y = 6 x + 7. x 0 = 4, y = 2 x 9.
. y = 6 x + 7, y = 2 x 9.
4. f (x) = x 2 2 x + 2 g (x) = x 2 3. .
. x 1 f (x), x 2 g (x).
f (x) x R. :
= (x 2 2 x + 2)′ = 2 x 2.
f (x 1) = x 2 x 1 + 2; (x 1) = 2 x 1 2. :
y = (2 x 1 2)(x x 1) + x 2 x 1 + 2,
y = (2 x 1 2) x x + 2. (1)
g (x):
= ( x 2 3)′ = 2 x.
g (x 2) = x 3; (x 2) = 2 x 2. :
|
|
y = 2 x 2 (x x 2) x 3,
y = 2 x 2 x + x 3. (2)
, (1) (2) : 2 x 1 2 = 2 x 2 x + 2 = x 3. x 1 x 2, x 1 = 2, x 2 = 1, x 1 = 1, x 2 = 2. , f (x) g (x). x 2 = 1, x 2 = 2 (2), : y = 2 x 2 y = 4 x + 1.
. y = 2 x 2, y = 4 x + 1.