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abc=ab+bc+ca . cat e abc=?

Răspuns :

ABC=a[tex] a^{2} + b^{2} +c^{2} [/tex]
100 a +10b+c=10a + b+ 10 b + c+10c+a 100 a + 10 b + c=11 a + 11 b + 11 c 89 a-b-10 c=0 89 a=b+10 =>a=1 b=9 c=8 . Nr e 198