Question

Решите следующий пример.
(7!+8!)/(5!+6!)

Answer 1

$dfrac{7!+8!}{5!+6!} = dfrac{7!cdot(1+8)}{5!cdot(1+6)} =dfrac{7!cdot9}{5!cdot7} =dfrac{1cdot2cdot...cdot7cdot 9}{1cdot2cdot...cdot5cdot 7}= 6cdot9=54$