N 1! !     N  . 1! 2! !2 3 4X X X X N       . LN(1 )...

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

2)

n

1! !

     n  .

1! 2! !

2 3 4

x x x x n

       .

ln(1 ) ... ( )

x O x

Trong đó, dxx dy ,  y ,   x

2

y

2

.