Question

 CẦN GIÚP GẤP VS Ạ . THANKS

Answer 1

2:

a: \(8^{10}-8^9-8^8\)

\(=8^8\cdot8^2-8^8\cdot8-8^8\cdot1\)

\(=8^8\left(8^2-8-1\right)=8^8\cdot55⋮55\)

b: \(7^6+7^5-7^4\)

\(=7^4\cdot49+7^4\cdot7-7^4\)

\(=7^4\left(49+7-1\right)=7^4\cdot55⋮11\)

c: \(81^7-27^9-9^{13}\)

\(=3^{28}-3^{27}-3^{26}\)

\(=3^{26}\cdot3^2-3^{26}\cdot3-3^{26}\cdot1\)

\(=3^{26}\left(3^2-3-1\right)=3^{26}\cdot5=3^{24}\cdot45⋮45\)

d: \(10^9+10^8+10^7\)

\(=10^7\cdot100+10^7\cdot10+10^7\)

\(=10^7\left(100+10+1\right)\)

\(=10^7\cdot111=10^6\cdot1110⋮555\)