x^2 - 2xy + y^2 - z^2 

=(x-y)²-z²

=(x-y-z)(x-y+z)

\(a,=\left(4x^2\right)^2\left(x-y\right)-\left(x-y\right)\)

\(=\left[\left(4x^2\right)^2-1^2\right]\left(x-y\right)\)

\(=\left(4x^2+1\right)\left(4x^2-1\right)\left(x-y\right)\)

\(=\left(4x^2+1\right)\left(2x+1\right)\left(2x-1\right)\left(x-y\right)\)

\(=\left(x-y\right)^2-z^2\)

\(=\left(x-y-z\right)\left(x-y+z\right)\)

Học tốt

\(x^2-2xy+y^2-z^2\)

\(=\left(x-y\right)^2-z^2\)

\(=\left(x-y-z\right)\left(x-y+z\right)\)

ta nhóm \(\left(x^2-2xy+y^2\right)-z^2\)

=\(\left(x-y\right)^2-z^2\)

=\(\left(x-y+z\right)\left(x-y-z\right)K\)nha

\(k\)\(mình\)\(nha\)

Âu Cơ

(Có x là nhân tử chung)

= x(x2 + 2xy + y2 – 9)

(Có x2 + 2xy + y2 là hằng đẳng thức)

= x[(x2 + 2xy + y2) – 9]

= x[(x + y)2 – 32]

(Xuất hiện hằng đẳng thức (3)]

= x(x + y – 3)(x + y + 3)

Hok tốt

Phần b đây nha

x2x2 – 2xy + y2y2 - z2z2

      = (x2x2 – 2xy + y2y2) – z2z2

      = (x−y)2x-y2 – z2z2

      = (x – y + z)(x – y – z)

Hok tốt

TL

a) x³-2x²+x-xy²

=x(x²-2x+1-y²)

=x[(x-1)²-y²]

=x(x-1-y)(x-1+y)

K mik nha 

HT

a) \(x^2-xy+x-y\)

\(=x\left(x-y\right)+\left(x-y\right)\)

\(=\left(x+1\right)\left(x-y\right)\)

b) \(x^2+5x+6\)

\(=x^2+2x+3x+6\)

\(=x\left(x+2\right)+3\left(x+2\right)\)

\(=\left(x+3\right)\left(x+2\right)\)

\(2xy-x^2-y^2+16\)

\(=16-\left(x-y\right)^2\)

\(=\left(4-x+y\right)\left(4+x-y\right)\)