12/17>7/15 NHA BN
CAC BN UNG HO NHA
12/17 = 180/255 7/15=119/255
vậy : 12/17>7/15
\(\frac{12}{17}=\frac{12.15}{17.15}=\frac{180}{255}\)
\(\frac{7}{15}=\frac{7.17}{15.17}=\frac{119}{255}\)
Do \(\frac{180}{255}>\frac{119}{255}\Rightarrow\frac{12}{17}>\frac{7}{15}\)