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2014-11-06T19:33:20+02:00
A:c=10r5⇒a=10xc+5b:c=5r4⇒b=5xc+4
a+b+c=121
10xc+5+5xc+4+c=121
16xc=121-9
16xc=112
c=112:16
c=7

a=10xc+5=10x7+5=70+5=75
a=75

b=5xc+4=5x7+4=35+4=39
b=39
  verificare a+b+c=75+39+7=114+7=121

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