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Daca 2,ab+3,bc+4,ca=9,66, atunci determinati a+b+c

Răspuns :

2,ab+3,bc+4,ca=9,66
2ab+3bc+4ca=966
200+10a+b+300+10b+c+400+10c+a=966
11a+11b+11c=966-900
11(a+b+c)=66
a+b+c=6