Question

Viết biểu thức sau thành tích :

(x - y)\(^3\)- 1 - 3(x - y)(x - y -1)

 

Answer 1

\(\left(x-y\right)^3-1-3\left(x-y\right)\left(x-y-1\right)\)

\(=\left(x-y-1\right)\left(x^2+\left(x-y\right)+1\right)-3\left(x-y\right)\left(x-y-1\right)\)

\(=\left(x-y-1\right)\left(x^2\left(x+y\right)+y^2-3\left(x-y\right)\right)\)

Answer 2

( x - y )³ - 1 - 3 ( x - y ) ( x - y - 1 )

= ( x - y - 1 ) [ x² - ( x - y ) - 1 ) - 3(x - y ) ( x - y - 1 ]

= ( x - y - 1 ) [ x² ( x - y ) - y ² - 3 ( x - y ) ]

k mik nha làm ơn đó