Ta co : \(\frac{15}{19};\frac{1515}{1919};\frac{151515}{191919}\)
\(\frac{1515}{1919}=\frac{15}{19}\)
\(\frac{151515}{191919}=\frac{15}{19}\)
\(\Rightarrow\frac{15}{19}=\frac{15}{19}=\frac{15}{19}\)
Vậy ta chứng tỏ rằng \(\frac{15}{19}=\frac{1515}{1919}=\frac{151515}{191919}\)