Rút gọn :\(\dfrac{x^{24}+x^{20}+x^{16}+...+x^4+1}{x^{26}+x^{24}+x^{22}+...+x^2+1}\)

Rút gọn

\(\dfrac{a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)}{ab^2-ac^2-b^3+bc^2}\)

Rút gọn phân thức

\(\dfrac{3^{3x}-3^{3y}}{3^x+3^y}\)

\(\dfrac{2^{4m}-2^{4n}}{2^{2n}+2^{2m}}\)