4x^2-4xy+y^2-z^2 sossssssssssssss

1 bình luận về “4x^2-4xy+y^2-z^2 sossssssssssssss”

1. 4x^2 – 4xy + y^2 – z^2

   = (2x)^2 – 2.2x.y + y^2 – z^2

   = (2x – y)^2 – z^2

   = (2x – y – z)(2x – y + z)

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