Question

Cho A=5+5^2+5^3+...+5 ^2013. Chứng tỏ rằng A chia hết cho 155

 

Answer 1

A=5+5^2+5^3+...+5^2013

A=(5+5^2+5^3)+(5^4+5^5+5^6)+...+(5^2011+2^2012+5^2013)

A=155+5^4*(5+5^2+5^3)+...+5^2011*(5+5^2+5^3)

A=155+5^4*155+...+5^2011*155

A=155*(5^4+...+5^2011) chia hết cho 155

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