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restabiliti sirul de rapoarte egele:
2/5=?/10=6/?=?/25=18/?

9/?=18/8=?/2=36/?=?/20

dau corana cine cel mai repede


Răspuns :

2/5=4/10=6/15=10/25=18/45
9/4=18/8=4.5/2=36/16=45/20
2/5=3;4/10=6/15=20/25=18/20