Chọn câu sai

A. (5 + a – b)(5 – a – b)  

B. (5 + a + b)(5 – a – b)   

C. (5 + a + b)(5 – a + b)  

D. (5 + a – b)(5 – a + b)

A. 16x³ – 54y³ = 2(2x – 3y)(4x² + 6xy + 9y²)

B. x² – 9 + (2x + 7)(3 – x) = (x – 3)(-x – 4)

C. x⁴ – 4x³ + 4x² = x²(x – 2)²

D. 4x³ – 4x² – x + 1 = (2x – 1)(2x + 1)(x + 1)

A. x + 5y

B. x – 5y

C. 5y – x

D. 5y + 2x

A. (x – 5)(x + 2)

B. (x – 5)(x - 2)

C. (x + 5)(x + 2)

D. (x – 5)(2 – x)

A. x⁴ + 4x² – 5 = (x² + 5)(x – 1)(x + 1)

B. x² + 5x + 4 = (x² – 5)(x – 1)(x + 1)

C. x² – 9x + 8 = (x² + 5)(x² + 1)          

D. x² + x – 6 = (x² – 5)(x + 1)

A. (x – 4)(x – 2)

B. (x – 4)(x + 2)

C. (x + 4)(x – 2)

D. (x – 4)(2 – x)

A. (m – 1)(n² – n + 1) (n + 1)

B. n²(n + 1)(m – 1)

C. (m + 1)(n² + 1)

D. (n³ + 1)(m – 1)