\(\frac{9}{9}\times\frac{9}{8}\div\frac{7}{9}=1\times\frac{9}{8}\times\frac{9}{7}=\frac{9}{8}\times\frac{9}{7}=\frac{81}{56}\)
tick nha
\(\frac{9}{9}\)x\(\frac{9}{8}:\frac{7}{9}=\frac{9}{8}:\frac{7}{9}\) = \(\frac{9}{8}\) x\(\frac{9}{7}\) =\(\frac{81}{56}\)
\(\frac{9}{9}\times\frac{9}{8}\div\frac{7}{9}=1\times\frac{9}{8}\times\frac{9}{7}=\frac{81}{56}\)