Помогите пожалуйста !
Упростите выражения а^2 + 3а + 2 / а^2 + 6a + 5
b^2 + 2b + 1 / b^2 + 8b + 7

Сократите дробь 7^n - 3*7^n-1 / 4
5^2n+1 - 5^2n-1 / 12 * 5^n-1
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