Corect este: a+b+c=4 pt ca am descompus suma initiala in baza 10; ab+bc+ca=20a+20b+20c=20•(a+b+c)=20•4=80
Asa
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Răspunsuri

2014-04-30T20:40:09+03:00
Daca abc+bca+cab=444 poti separa in:
100a+100b+100c=400
10a+10b+10c=40
a+b+c=4
Dupa aceeasi regula:
ab+bc+ca=10a+10b+10c (a doua suma) + a+b+c(a doua suma)=40+4=44