Va rog ajutati-ma urgent!
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2/7 = 6/21 ( 2/7 amplificat cu 3 = 6/21 )
225 / 900 = 1/4 ( 225/900 simplificat cu 225 = 1/4)
3/7 si 18/420 nu formeaza proportii
1,2/3 si 1/5 nu formeaza proportii
1,2/3 = 2/5