.
5.1. = f (x), , 0 , f (x) = f (x 0).
5.1. f (x) = 2 2 + 2 +1 0 = 1.
. :
1) f (x) = (2 2 + 2 +1) = 2 x 2 + 2 x + 1 = 2 × 1 + 2 × 1 + 1 = 5.
2) f (1) = 2 × 12 + 2 × 1 + 1 = 5.
f (x) = f (1), f (x) 0 = 1.
5.2. 0, 0 Î . ∆ = − 0 0, ∆ = f (x) − f (x 0) = f (x 0 + ∆ x) − f (x 0) 0.
5.1. = f (x) 0 Î , ∆ = 0.
. 1 = f (x) 0 Î . , f (x) = f (x 0). = 0 + ∆ .
f (x 0 + ∆ x) = f (x 0),
f (x 0 + ∆ x) − f (x 0) = 0, ((x 0 + ∆ x) − f (x 0)) = 0,
. . ∆ = 0.
2 ∆ = 0. ((x 0 + ∆ x) − f (x 0)) = 0, f (x 0 + ∆ x) − f (x 0) = 0, f (x 0 + ∆ x) = f (x 0). , = f (x) 0.
5.2. f (x) φ() 0, f (x) + φ(x), f (x) − φ(x), f (x) × φ(x), f (x)/φ(x) , φ( 0) ≠ 0.
.
, :
1) Pn (x) = Î R;
2) - R (x) = , ;
3) = sin x, y = cos x, y = tg x, y = ctg x .
5.3. z = φ(x) 0, = f (z) z 0 = φ(x 0). = f (φ(x)) 0.
, .
5.2. , = sin x 2 0 = 0.
. z = x 2 0 = 0 . = sin z z 0 = x 02 = 0, 5.3 = sin z = sin x 2 0 = 0.
5.3. , . = f (x) = f (), , f (x) . , f (x) = f (), , f (x) . , ( , ).
|
|
, , , .
5.4. ( -).
f (x) [ ] . Î [ ], f () = 0.
5.5. ( -).
f (x) [ ], f () = A, f () = B. , . [ ] , f () = C.
5.6. ( ).
f(x) [ ], .
5.7. ( ).
f(x) [ ], , . . 1, 2 Î [ ], Î [ ] f (x 1) £ f (x) £ f (x 2).