3/5=27/45
7/9=35/45
Vì: 27/45<35/45=>3/5<7/9
3/5= (3x9)/(5x9)= 27/45
7/9= (7x5)/(9x5) = 35/45
Vì: 27/35< 35/45 => 3/5< 7/9
3/5= (3x9)/(5x9)= 27/45
7/9= (7x5)/(9x5) = 35/45
Vì: 27/35< 35/45 => 3/5< 7/9
3/5= (3x9)/(5x9)= 27/45
7/9= (7x5)/(9x5) = 35/45
Vì: 27/35< 35/45 => 3/5< 7/9