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Care sunt numerele naturale de trei cifre care au suma cifrelor 12 si cifra sutelor 7?

Răspuns :

 

[tex]\displaystyle\bf\\Se~da~~\overline{abc}~~cu:\\a+b+c=12\\a=7\\\implies~b+c=12-7=5\\\\\text{Rezulta numerele:}\\\\\boxed{\bf705;~714;~723;~732;~741;~750}[/tex]