Упростите выражение:
[tex]\ \textless \ br /\ \textgreater \ а)\ \textless \ br /\ \textgreater \ \frac{x \times x ^{5} \times x ^{7} }{x ^{4} } \ \textless \ br /\ \textgreater \ б)\ \textless \ br /\ \textgreater \ \frac{5c ^{5} \times c}{c ^{4} } [/tex]

а)

б)