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Afla toate numerele naturale de forma abc, in care 4a+b+c=12.

Răspuns :

a+b+c=12/4
a+b+c=3
sper cai bun

a+b+c=12/4
⇒a+b+c=3;
⇒a∈[1,2,3];
⇒b∈[0,1,2,3];
⇒c∈[0,1,2,3];
⇒numerele sunt 102,120,111,201,210,300;⇒6 numere naturale;