Пожалуйста срочно заранее спасибо

76.
1)
$\frac{a {}^{8} \times a {}^{5} }{a {}^{3} \times a {}^{6}} = \frac{a {}^{13} }{a {}^{9} } = a {}^{4}$
2)
$\frac{a {}^{9} \times a {}^{6} }{a {}^{5} \times a {}^{8} } = \frac{a {}^{15} }{a {}^{13} } = a {}^{2}$
3)
$\frac{(a {}^{8}) {}^{4} \times (a {}^{4}) {}^{3} }{a {}^{6} \times a {}^{9} } = \frac{a {}^{32} \times a {}^{12} }{a {}^{15} } = \frac{a {}^{44} }{a {}^{15} } = a {}^{29}$
4)
$\frac{a {}^{6} \times (a {}^{3}) {}^{4}}{(a {}^{4}) {}^{3} \times a {}^{2} } = \frac{a {}^{6} \times a {}^{12} }{a {}^{12} \times a {}^{2}} = \frac{a {}^{18} }{a {}^{14} } = a {}^{4}$