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a fost răspuns

Determina nr natural abc stiind ca abc+bc+cb+5a=216

Răspuns :

abc=100a+10b+c
bc=10b+c
cb=10c+b
==>
100a+10b+c+10b+c+10c+b+50+a=100a+21b+12c+50+a=216|-50
101a+21b+12c=165