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$a)$ $10^{8}$ $.$ $2^{8}$
$=$ $($ $10$ $.$ $2$ $)^{8}$
$=$ $20^{8}$
$b)$ $10^{8}$ $:$ $2^{8}$
$=$ $($ $10$ $:$ $2$ $)^{8}$
$=$ $5^{8}$
$=$ $390625$
$c)$ $25^{4}$ $.$ $2^{8}$
$=$ $(5^{2})^{4}$ $.$ $2^{8}$
$=$ $5^{8}$ $.$ $2^{8}$
$=$ $($ $5$ $.$ $2$ $)^{8}$
$=$ $10^{8}$
$=$ $100000000$
$d)$ $15^{8}$ $.$ $9^{4}$
$=$ $15^{8}$ $.$ $(3^{2})^{4}$
$=$ $15^{8}$ $.$ $3^{8}$
$=$ $($ $15$ $.$ $3$ $)^{8}$
$=$ $30^{8}$
$FbBinhne2k88$
