Power of a Quotient Rule for Exponents: Combination of different bases

Insert the corresponding expression:

$\frac{2^3\times4^5}{2\times4^2}=$

a'+b' are correct

Insert the corresponding expression:

$\frac{6^7\times8^5}{8^6\times6^2}=$

$6^5\times8^{-1}$

Insert the corresponding expression:

$\frac{a^5\times b^3\times x^2}{a^2\times b\times x}=$

$a^3\times b^2\times x$

Insert the corresponding expression:

$\frac{\left(2\times3\right)^4\times\left(6\times7\right)^7}{\left(2\times3\right)^2\times\left(6\times7\right)^4}=$

$\left(2\times3\right)^2\times\left(6\times7\right)^3$