Simplify:

$\displaystyle \frac{{\left({5}{a}^{{5}}{b}^{{7}}\right)}^{{3}}}{{{5}{a}{b}^{{3}}}}$

Entry Tips:

1. Use ^ (shift+6) for exponents. To type $\displaystyle {x}^{{2}}$ type "x^2"

2. Use parenthesis if there is more than one "thing" in the numerator or denominator. To type $\displaystyle \frac{{{2}{a}}}{{{c}-{4}}}$ type "(2a)/(c-4)".