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Aflati cifra a stiind ca aaa+aa+a=861


Răspuns :

aaa+aa+a=861(aaa si aa sunt in baza 10)
100a+10a+a+10a+a+a=861
100a+20a+3a=861
123a=861
a=861:123
a=7
777+77+7=861
bafta!:)