Question

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

Answer 1

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

\(=x^3-x^2y-x^2y-xy^2+y^2x-y^3\)

\(=x^3+y^3\)

\(=(x-y)(x^2-xy-y^2)\)

Answer 2

`(x^2-xy+y^2)(x-y)`

`=(x-y)(x^2-xy+y^2)`

`=x^3-y^3`

`->` HĐT số `7:` `a^3-b^3=(a-b)(a^2-ab+b^2)`

Answer 3

 = x² . x - x² . y - xy . x + xy . y + y² . x + y² . y

= x³ - x²y -x²y + xy² + xy² + y³

= x3 - 2x²y + 2xy² + y3