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gaseste numerele naturale din egalitatile;abc=11(a+b+c)

Răspuns :

abc=11(a+b+c) <=> 100a+10b+c=11a+11b+11c <=> 89a=b+10c.

Cum a,b,c sunt cifre (a≠0) => b+10c≤99 => 89a≤99 => a=1.

a=1 => 89=b+10c.
10c are ultima cifra 0 => b=9.

89=b+10c <=> 89=9+10c=>10c=80=>c=8.

Solutie: abc=198.