Phân tích đa thức $m.n^3 – 1 + m – n^3$ thành nhân tử, ta được:

A. (x – 5)(x + 2)

B. (x – 5)(x - 2)

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

D. (x – 5)(2 – x)

A. (x – 4)(x – 2)

B. (x – 4)(x + 2)

C. (x + 4)(x – 2)

D. (x – 4)(2 – x)

A. $\left(x^2-x+1\right)\left(x^5+x^4+x^2-x-1\right)$

B. $\left(x^2-x+1\right)\left(x^5+x^4-x^2-x-1\right)$

C. $\left(x^2+x+1\right)\left(x^5+x^4+x^2-x-1\right)$

D. $\left(x^2+x+1\right)\left(x^5+x^4-x^2-x-1\right)$

A. 2x + y + 1

B. 2x – y + 1

C. 2x – y

D. 2x + y

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. (a + b + c)(ab – bc – ac)

B. (a + b + c)(ab + bc + ca)

C. (a + b – c)(ab + bc + ac)

D. (a + b + c)(ab – bc + ac)