Question

giải hộ mình bài 4 với ạ 

Answer 1

4:

\(A=7^{4n}-1\)

\(=\left(7^4\right)^n-1\)

\(=\left(7^4-1\right)\cdot\left(7^{4\left(n-1\right)}+7^{4\left(n-2\right)}+...+1\right)\)

\(=\left(7^2-1\right)\left(7^2+1\right)\left(7^{4n-4}+7^{4n-8}+...+1\right)\)

\(=50\cdot48\cdot\left(7^{4n-4}+7^{4n-8}+...+1\right)⋮5\)