Bạn tham khảo :
$15^8 . 9^4 = 3^8 . 5^8 . 3^8 = (3.5.3)^8 = 45^8$
$4^9 : 5^27 = 4^9 : (5^3)^9 = 4^9 : 125^9 = (4:125)^9 = (0,032)^9$
$20^{10} : 2^{20} = 20^{10} : (2^2)^{10} = 20^{10} :4^{10} = (20:4)^{10} = 5^{10}$
$27^5 : (-7)^{15} = 27^5 : (-7^3)^5 = 27^5 : (-343)^5 = (\dfrac{27}{-343})^5$