3 6 2 8 3 1 2 2 1 2 A) A = 3 2 1 2 1 2 1 2 1 2 ...
Câu 2: 3 6 2 8 3 1 2 2 1 2
a) A = 3 2
1 2 1 2 1 2 1 2
1 1 x + 2 x
b) B = .
x 4 x + 4 x 4 x
= x 2 1 x 2 ( x 2) 1
2