Răspuns:
2.
a)Numitor comun 15
4/15 + (2•5)/15 = 14/15
b)Numitor comun 93
16/93 + (6•3)/93 = 34/93
c)Numitor comun 32
7/32 - (1•2)/32 = 5/32
d)Numitor comun 42
23/42 - (3•5)/42 = 8/42 = 4/21
3.
a)Numitor comun 24
[(5•2)+5]/24 = 15/24 = 5/8
b)Numitor comun 42
[(26•2)+(13•3)]/42 = 91/42
c)Numitor comun 60
[(4•4)+(3•3)]/60 = 25/60 = 5/12
d)Numitor comun 24
(5+1•2+3•3)/24 = 16/24 = 2/3
e)Numitor comun 60
[(7•2)-(3•3)]/60 = 5/60 = 1/12
f)Numitor comun 60
[(8•4)-(9•3)]/60 = 5/60 = 1/12
g)Numitor comun 105
[(8•5)-(4•3)]/105 = 28/105 = 4/15
h)Numitor comun 12
[(7•2)-(3•3)-1]/12 = 4/12 = 1/3
