Ответ:

7

Объяснение:

(a^3 + a^2 - 2a) / a^2 : (1 - 1 / a) = (a ( a + a (a + 2) - (a + 2)) /  a^2 : ((a - 1) / a) =(a + 2)(a - 1) / a * ( a / (a + 1) ) = (a + 2)(a - 1) * ( 1 / (a - 1) ) = (a + 2) * (a - 1) : (a - 1) = a + 2

Подставляем a = 5:

a + 2 = 5 + 2 = 7