Phân tích đa thức $x^2$ – 7x + 10 thành nhân tử ta được

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. (m – 1)(n + 1)$\left(n^2-n+1\right)$

B. $n^2(n + 1)(m – 1)$

C. (m + 1)($n^2$ + 1)

D. ($n^3$ + 1)(m – 1)

A. (a + b)(a – c)(b – c)

B. (a + b)(a – c)(b + c)

C. (a – b)(a – c)(b – c)

D. (a + b)(c – a)(b + c)