Question

tính:

a) (x - 50)(x+50)

b) (xy - 3)(x²y² + 3xy + 9)

Answer 1

\(a.\left(x-50\right)\left(x+50\right)=x^2-2500\\ b.\left(xy-3\right)\left(x^2y^2+3xy+9\right)=x^3y^3-27\)

Answer 2

a) (x - 50) (x + 50) = x² - 50²= x² - 2500

b) (xy - 3) (x²y² + 3xy + 9)

= (xy - 3) ( (xy)² + xy.3 + 3² )

= (xy - 3)³