Question

Tính:

a) \({\left( {x + 2y} \right)^3}\)                                              b) \({\left( {3y - 1} \right)^3}\)

Answer 1

`a, (x+2y)^3 = x^3 + 6x^2y + 12xy^2 + 8y^3`

`b, (3y-1)^3 = 27y^3 - 27y^2 + 3y-1`

Answer 2

`a)`

`(x + 2y)^3`

`= x^3 + 6x^2y + 12xy^2 + 8y^3`

`b)`

`(3y - 1)^3`

`= 27y^3 - 27y^2 + 9y - 1`