56ⁿ
Объяснение:
28²ⁿ⁺¹ /2ⁿ⁺²·7ⁿ⁺¹ = (4·7)²ⁿ⁺¹ /2ⁿ·2²·7ⁿ·7¹ = 4²ⁿ⁺¹·7²ⁿ⁺¹ /2ⁿ·2²·7ⁿ·7¹ =
= 4²ⁿ·4·7²ⁿ·7/2ⁿ·4·7ⁿ·7 =4²ⁿ·7²ⁿ·/2ⁿ·7ⁿ = 2⁴ⁿ·7²ⁿ·/2ⁿ·7ⁿ = 2⁴ⁿ⁻ⁿ· 7²ⁿ⁻ⁿ =2³ⁿ·7ⁿ=
=8ⁿ·7ⁿ= 56ⁿ
