11/18 amplificãm ca sa il aducem la acelasi numitor=> 11/18 amplificãm cu 4 =11×4/18×4=44/72
5/24 amplificãm cu 3 =5×3/24×3=15/72
=>44/72-15/72-1/72=28/72
28/72 simplificam cu 2=> 28/32 amplificãm iar cu 2=>28/18
p) 55/33 amplificãm cu 2
55×2/33×2=110/66
=>110/66-77/66=33/66 simplificam cu 2 =>33/33 amplificãm cu 3 =>33/11
gata!