Ответ:

  1. \(9^{7-10}=9^{-3}=\frac1{729}\).
  2. \((0{,}2)^{2-(-2)}=(0{,}2)^4=\frac1{625}\).
  3. \(\left(\frac2{13}\right)^{-12-(-10)}=\left(\frac2{13}\right)^{-2}=\frac{169}{4}\).
  4. \(\left(\frac25\right)^{3-(-1)}=\left(\frac25\right)^4=\frac{16}{625}\).