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daca abc+bca+cab = 444 atunci ab +bc +ca= ? ?

Răspuns :

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