2. (7! + 8!) / (5! + 6!)

Question

Решение: 7! = 7*6!, 8! = 8*7*6!. 5! = 5*6!. (7*6! + 8*7*6!) / (5*6! + 6!) = (7+56)/(5+1) = 63/6 = 21/2. Ответ: 21/2.

Accepted Answer

Решение: 7! = 7*6!, 8! = 8*7*6!. 5! = 5*6!. (7*6! + 8*7*6!) / (5*6! + 6!) = (7+56)/(5+1) = 63/6 = 21/2. Ответ: 21/2.