Baì 1 Chứng minh rằng

a)\(7^6+7^5-7^4⋮11\)

b)\(81^7-27^9-9^{13}⋮45\)

1)Tính

a)\(\frac{\left(3^3\right)^2\times\left(2^3\right)^5}{\left(2\times3\right)^6\times\left(2^5\right)^3}\)

2)So sánh

\(5^{1000}\)và\(3^{1500}\)

3)Tìm x biết

\(\left(\frac{1}{2}\right)^{x+1}=\frac{1}{16}\)