pt đa thức thành nt `a, x^2 -8x` b, `x^2 -xy -6x +6y` c, `x^2 -6x+9- y^2`

2 bình luận về “pt đa thức thành nt `a, x^2 -8x` b, `x^2 -xy -6x +6y` c, `x^2 -6x+9- y^2`”

1. @Tbc

   

   Trả lời
2. $\text{ a) x^2 – 8x }$

   $\text{ = x ( x-8 ) }$

   $\text{ b) x^2 – xy – 6x + 6y }$

   $\text{ = ( x^2 – xy ) – ( 6x – 6y ) }$

   $\text{ = x ( x – y ) – 6 ( x – y}$

   $\text{ = ( x – y ) ( x – 6 ) }$

   $\text{ c) x^2 – 6x + 9 – y^2 }$

   $\text{ = ( x^2 – 6x + 9 ) – y^2}$

   $\text{ = ( x^2 – 2 . x . 3 + 3^2 ) – y^2 }$

   $\text{ = ( x – 3 )^2 – y^2}$

   $\text{=)))}$

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