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  • Utilizator Brainly
2014-03-18T17:16:26+02:00
A.I____I____I____I+2
b.I____I ......20 ......⇒ diferenta 

 20-2=18 suma partilor egale
 18:2=9 ( b )
 9x3+2=29 ( a )
 Verificare : 29-9=20