Question

$frac{(3 x^{2} -4xy-4 y^{2})(9 x^{2} -6xy+4 y^{2})}{27 x^{3}+8 y^{3}}$
Можно с пояснением.

Answer 1

$frac{(3x^2-4xy-4y^2)(9x^2-6xy+4y^2)}{(2y+3x)(4y^2-6xy+9x^2)}=\\ frac{x(3x+2y)-2y(3x+2y)}{2y+3x}=frac{(x-2y)(3x+2y)}{3x+2y}=x-2y$