Question

chứng tỏ rằng   \(10^9+10^8+10^7\) \(⋮\) 555

Answer 1

\(10^9+10^8+10^7=10^7\left(1+10+100\right)=10^7.111=10^6.10.111=10^6.2.5.111=10^6.2.555\) chia hết cho 555

Answer 2

\(10^9 + 10^8 + 10^7 = 10^7(10^2 + 10 + 1) = 10^7.111\)⋮111

\(10^9 + 10^8 + 10^7 = 10(10^8 + 10^7 + 10^6)\) ⋮ 5

Vậy :

\(10^9 + 10^8 + 10^7\)⋮555

Answer 3

\(10^9+10^8+10^7=10^7\left(10^2+10+1\right)=10^7.111⋮555\left(111.5\right)\)