Question

(a-2)(a-3)+(7a^4-21a^2)/(-7a^2)

Answer 1

a^2 - 3a - 2a+6 -7a^2*(a^2-3)/(7a^2), сокращаем 7a^2:
a^2 - 5a +6 - a^2 +3 = 9-5a
Ответ: 9-5a