Question

Bằng phương pháp nhóm hạng tử.

x²-2xy+y²-z²

Answer 1

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

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

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

Answer 2

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

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

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

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

Answer 3

(x²-2xy+y²⁾-z²

<=>(x-y)²-z²

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