Question

Tìm x

(1+5+5^2+5^3+...+5^2010+5^2011)*(x-1)=5^2012-1

Các bạn giải giúp mik nha

Cảm ơn nhiều

Answer 1

Đặt \(\left(1+5+5^2+5^3+...+5^{2010}+5^{2011}\right)\) là A

\(\Rightarrow5A=5+5^2+5^3+5^4+...+5^{2011}+5^{2012}\)

\(\Rightarrow5A-A=5+5^2+5^3+5^4+...+5^{2011}+5^{2012}-1-5-5^2-5^3-...-5^{2010}-5^{2011}\)

\(\Rightarrow4A=5^{2012}-1\)

\(\Rightarrow A=\frac{1}{4}\left(5^{2012}-1\right)\)

Thay A vào, ta có:

\(\frac{1}{4}\left(5^{2012}-1\right)\left(x-1\right)=5^{2012}-1\)

\(\frac{1}{4}\left(x-1\right)=1\)

\(x-1=4\)

\(x=3\)