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determinati suma cifrelor nenule a si b , siniind ca ab6+3ab+b9a =1173


Răspuns :

ab6+3ab+b9a =1173
100a+10b+6+300+10a+b+100b+90+a=1173
111a+111b=1173-90-300-6
111a+111b=777
a+b=7