Đặt tổng trên là A
\(8A=\frac{8}{1.9}+\frac{16}{9.25}+\frac{24}{25.49}+...+\frac{96}{529.625}\)
\(8A=\frac{9-1}{1.9}+\frac{25-9}{9.25}+\frac{49-25}{25.49}+...+\frac{625-529}{529.625}\)
\(8A=1-\frac{1}{625}=\frac{624}{625}\Rightarrow A=\frac{624}{8.625}=\frac{78}{625}\)