2      X 1 X 1 X 4X 1 X 2003X 1 X 1 X 1 . X  2  BAỨI...

2

.

2

x 1

x 1

x

4x 1

x 2003

x 1

x 1

x

1

.

x

Baứi 5 : Cho biểu thức: A =

.