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Răspuns:
2:3:4:5:6=5
(2:3):(4:5:6)=5
2:3=0,(6)
0,(6)=6/9=2/3
4:5:6=0,1(3)
0,1(3)=(13-1)/90=12/90=2/15
verificare:
2/3:2/15=2/3·15/2=5