Question

tính 27x^3-y^3

8x^3+y^3

Answer 1

27x³ - y³

= ( 3x )³ - y³

= ( 3x - y ) ( 9x² + 3xy + y² )

8x³ + y³

= ( 2x )³ + y³

= ( 2x + y ) ( 4x² - 2xy + y² )

Answer 2

27x^3-y^3= (3x)^3 - y^3 = (3x-y)(9x^2+3xy+y^3)

8x^3 + y^3 = (2x)^3 +y^3 = (2x+y)(4x^2-2xy+y^2)

Answer 3

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