[tex]10^{10}.\frac{a}{b}-\frac{a}{b}=51234567893,1234567893...-5,1234567893..=51234567888<=>\frac{a}{b}=\frac{51234567888}{10^{10}-1}[/tex]
=> a= tử, b= mẫu => tổng là A
[tex]10^{10}.\frac{a}{b}-\frac{a}{b}=51234567893,1234567893...-5,1234567893..=51234567888<=>\frac{a}{b}=\frac{51234567888}{10^{10}-1}[/tex]
=> a= tử, b= mẫu => tổng là A