a) 1/18+1/9+1/6= 1/18+ 2/18+3/18 = 6/18 = 1/6
Le am amplificat pe 1/9 cu 2, iar pe 1/6 cu 3
b) 7/36 - 1/18 + 3/4 = 7/36 - 2/36 - 27/36 = 36/36 = 1
c) 37/18 - 3/4 - 5/6 = 74/36 - 27/ 36 - 30/36= 17/36
d) 11/18 - 4/9 +5/6 -1/9 = 22/36 - 16/36 + 35/36 - 4/36 = 37/36
