$0,6^8$

$0,6^6$

$0,6^7$

$0,6^{15}$

$a^0$

$a^{26}$

$a^{27}$

$a^{53}$

$x^1$

$x^2$

$1$

$x^6$

$10$

$7$

$6$

$3$

$A$

$B$

$C$

$D$

$2^{12}$

$2^{36}$

$2^{30}$

$2^{10}$

$10^{10}$

$10^9$

$10^{21}$

$10^{20}$

$27^6<3^{2^5}<3^{5^2}<\left(3^5\right)^4$

$\left(3^5\right)^4<3^{5^2}<3^{3^5}<27^6$

$27^6<3^{5^2}<\left(3^5\right)^4<3^{2^5}$

$27^6<\left(3^5\right)^4<3^{5^2}<3^{2^5}$

$2^{14}$

$2^{49}$

$2^0$

$2^{21}$