RÚT GỌN CÁC BIỂU THỨC SAU

Bài 1. Rút gọn các biểu thức sau:

a) ( 6x 1 + ) (

2

+ 6x 1 )

2

2 1 6x ( + )( 6x 1 )

b) 3x x ( 2 ) 5x 1 x ( ) 8 x (

2

3 )

c) ( 7x 3 2x 1 )( + − ) ( 5x 2 x )( + 4 ) 9x

2

+ 17x

d) (6x 5)(x 8) (3x 1)(2x 3) 9(4x 3) − + − − + − −

e) − 3x(x + 2)

2

+ (x + 3)(x 1)(x 1) (2x − + − − 3)

2

f) 2x(x − 4)

2

− (x + 5)(x − 2)(x + + 2) 2(x − 5)

2

− (x 1) −

2

g) ( x 2 x ) (

2

+ 2x + − 4 ) ( x 1 )

3

+ 7

h) x x ( 2 )( x + 2 ) ( + x + 3 x ) (

2

3x + 9 )

i) ( 3x + 2 )

3

18x 3x ( + 2 ) ( + x 1 )

3

28x

3

+ 3x(x 1)