Question

Rút gọn phân thức \(\dfrac{x^2-9y^2}{x^2+xy-6y^2}\)

Answer 1

\(\dfrac{x^2-9y^2}{x^2+xy-6y^2}=\dfrac{\left(x-3y\right)\left(x+3y\right)}{\left(x-2y\right)\left(x+3y\right)}=\dfrac{x-3y}{x-2y}\)