Question

Tính:

a) \({\left( {3x + 4} \right)^2}\)                                  b) \({\left( {5x - y} \right)^2}\)                                   c) \({\left( {xy - \dfrac{1}{2}y} \right)^2}\)

Answer 1

`a, (3x+4)^2 = 9x^2 + 24x + 16`

`b, (5x-y)^2 = 25x^2 - 10xy + y^2`

`c, (xy - 1/2y)^2 = x^2y^2 - xy^2 + 1/4y^2`