![Kh?o sát hàm s?
(x)->-5*x^3-3*x^2+5*x+1
??o hàm:
y = ?15x2 ? 6 · x + 5
C?c tr?:
?1 √
x1 = · (3 + 2 · 21)
15
?1 √
x2 = · (3 ? 2 · 21)
15
Giá tr? c?c tr?: √
(?112 ·21 ? 18)
y1 =
225
√
(112 · 21 ? 18)
y2 =
225
?i?m u?n:
?1
x=
5
?2
y=
25
Giao ?i?m v?i tr?c hoành
x = [?1.265372, ?0.185712, 0.851084]
B?ng bi?n thiên:
x ?∞ (?2 21?3) (2 21?3) +∞
15 15
f (x) ? 0 + 0 ?
+∞ (112 21?18)
225
f
(?112 21?18) ?∞
225
1](https://image.slidesharecdn.com/btxcas1-120714115855-phpapp02/85/Btxcas1-1-320.jpg)
Btxcas1
- 1. Kh?o sát hàm s? (x)->-5*x^3-3*x^2+5*x+1 ??o hàm: y = ?15x2 ? 6 · x + 5 C?c tr?: ?1 √ x1 = · (3 + 2 · 21) 15 ?1 √ x2 = · (3 ? 2 · 21) 15 Giá tr? c?c tr?: √ (?112 ·21 ? 18) y1 = 225 √ (112 · 21 ? 18) y2 = 225 ?i?m u?n: ?1 x= 5 ?2 y= 25 Giao ?i?m v?i tr?c hoành x = [?1.265372, ?0.185712, 0.851084] B?ng bi?n thiên: x ?∞ (?2 21?3) (2 21?3) +∞ 15 15 f (x) ? 0 + 0 ? +∞ (112 21?18) 225 f (?112 21?18) ?∞ 225 1
- 2. ?? th?: y 3 1 x ?4 ?2 O 1 3 ?2 ?4 2