Question

So sánh A= 10^2005 + 1 / 10^2006 +1 ; B = 10^2004 + 1 / 10^2005 +1

Answer 1

                    ta có công thức \(\frac{a}{b}

Answer 2

\(10A=\frac{10^{2006}+10}{10^{2006}+1}=\frac{10^{2006}+1+9}{10^{2006}+1}=\frac{10^{2006}+1}{10^{2006}+1}+\frac{9}{10^{2006}+1}=1+\frac{9}{10^{2006}+1}\left(1\right)\)

\(10A=\frac{10^{2005}+10}{10^{2005}+1}=\frac{10^{2005}+1+9}{10^{2005}+1}=\frac{10^{2005}+1}{10^{2005}+1}+\frac{9}{10^{2005}+1}=1+\frac{9}{10^{2005}+1}\left(2\right)\)

Từ (1) và (2)

=>A<B