Question

Làm tính nhân

a) \(\left(\dfrac{1}{2}x+y\right)\left(\dfrac{1}{2}x+y\right)\)

b) \(\left(x-\dfrac{1}{2}y\right)\left(x-\dfrac{1}{2}y\right)\)

Answer 1

Answer 2

a) (x + y)(x + y) = x . x + x . y + y . x + y . y

= x² + xy + xy + y²

= x² + xy + y²

b) (x - y)(x - y) = x . x + x(-y) + (-y . x) + (-y)(-y)

= x² - xy - xy + y²

= x² - xy + y²

Answer 3

Chuc ban hoc tap tot!!