Ngày tải lên :
27/02/2015, 14:42
... − 12 x + x + 16 > ⇔ x − x − < BPT 4 ⇔ x ∈ −1; ÷ 3 0, 25 0, 25 0, 25 5a 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0, 25 0 ,50 0, 25 0, 25 0, 25 0 ,50 b) y = 2 x + x + x − x0 = −1 ⇒ y0 = −9 0, 25 ... cot x 0, 25 sin 2 x 0, 25 y′ + y + = − + cot 2 x + 2 sin x 0, 25 = 2( 1 + cot 2 x ) + cot 2 x + = 2 − cot 2 x + cot 2 x + = b) 0, 25 0, 25 y= 3x + 1− x y′ = ( x − 1 )2 0 ,50 k = y′ (2) = 0, 25 y = ... x 2 x − ( x − 1)( x − 2) 0 ,50 (1) f (2) = (2) Từ (1) (2) ta suy f(x) liên tục x = a) b) y= 2x2 − x − 8x + ⇒ y' = x 2 ( x − 2) 2 y = cos − x ⇒ y ' = x sin − x − 2x2 0, 25 0, 25 0 ,50 0 ,50 0, 25 a)...