1 2 . X      1N NDF D F(0; 0) (0; 0)2X X X X N NF X Y F O( ,...

1) - TOÁN A3 C3 HUFI EXAM CHUONG 1 A3DH
Toán TOÁN A3 C3 HUFI EXAM CHUONG 1 A3DH

1) 1 2

 .

x      

1

n n

df d f

(0; 0) (0; 0)

2

x x x x n n

f x y f O

( , ) (0;0) ... ( ).

    