Ta có: \(\frac{3}{9}=\frac{3\cdot2}{9\cdot2}=\frac{6}{18}\)
Mà \(\frac{6}{18}=\frac{1}{18}+\frac{2}{18}+\frac{3}{18}\)
\(=\frac{1}{18}+\frac{1}{9}+\frac{1}{6}\)
\(\Rightarrow\frac{3}{9}=\frac{1}{18}+\frac{1}{9}+\frac{1}{6}\)
Trả lời:
\(\frac{3}{9}=\frac{3.2}{9.2}=\frac{6}{18}\)
Mà \(\frac{6}{18}=\frac{1}{18}+\frac{2}{18}+\frac{3}{18}\)
\(=\frac{1}{18}+\frac{1}{9}+\frac{1}{6}\)
\(\Rightarrow\frac{3}{9}=\frac{1}{18}+\frac{1}{9}+\frac{1}{6}\)