A) 3X(4X – 3) – (2X – 1)(6X + 5) B) 3X(X – 1)2 – 2X(X + 3)(X – 3) + 4X(X – 4) C) (X + 1)(X2 + X + 1)(X – 1)(X2 – X + 1) C) (6X + 1)2 + (6X – 1)2 – 2(1 + 6X)(6X – 1) E) 3X(X – 2) – 5X(1 – X) – 5(X2 – 3)

Bài 3: Rút gọn biểu thức:

a) 3x(4x – 3) – (2x – 1)(6x + 5)

b) 3x(x – 1)

2

– 2x(x + 3)(x – 3) + 4x(x – 4) c) (x + 1)(x

2

+ x + 1)(x – 1)(x

2

– x + 1)

c) (6x + 1)

2

+ (6x – 1)

2

– 2(1 + 6x)(6x – 1) e) 3x(x – 2) – 5x(1 – x) – 5(x

2

– 3)