C1) \(\frac{7}{11}=\frac{119}{187}\)
\(\frac{13}{17}=\frac{143}{187}\)
Do 119<143 => 119/187 < 143/187 => 7/11 < 13/17
C2) \(\frac{7}{11}=\frac{91}{143}\)
\(\frac{13}{17}=\frac{91}{119}\)
Do 143>119 => 91/143 < 93/119
=> 7/11 < 13/17
C3) \(\frac{7}{11}=\frac{11-4}{11}=1-\frac{4}{11}\)
\(\frac{13}{17}=\frac{17-4}{17}=1-\frac{4}{17}\)
Do 4/11>4/17 => 1-4/11 < 1-4/17 => 7/11 < 13/17