Răspuns:
1) ⁴⁾7/6 , ³⁾21/8 , ⁶⁾11/4 , ⁸⁾8/3
28/24 , 63/24 , 66/24 , 64/24 avem acelasi numitor comun
ordonam crescator : 7/6 , 21/8 , 8/3 , 11/4
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2) a+b/5=17/5
c+d/3=26/6
b/5=> b<5=>b=0,1,2,3,4
a=17/5-b/5
a=(17-b)/5=>a=(17-2)/5=>a=15/5=>a=3
b=2
c+d/3=(26/6)⁽²
d < 3
c+d/3=13/3=>c=13/3-d/3=>c=(13-d)/3=>d=0,1,2
c=(13-1)/3=>c=12/3=>c=4
d=1
ac+bd=3·4+2·1=12+2=14
