Question

А^6 + а^13 / а^-6 + а^-13 помогите

Answer 1

$\displaystyle \frac{a^{6}+a^{13}}{a^{-6}+a^{-13}}=( a^{6}+a^{13}):( \frac{1}{a^{6}}+ \frac{1}{a^{13}})=(a^{6}+a^{13}): \frac{a^{7}+1}{a^{13}}= \\ \\ \\ =a^{6}(a^{7}+1)* \frac{a^{13}}{a^{7}+1}=a^{19}$