Răspuns :

Danaradu70id

Răspuns:

Explicație pas cu pas:

12x ∈ {120,121,122,123,124,125,126,127,128,129}

5x3∈{503,513,  523, 533, 543,553,563,573,583,593}

xy ∈{10, 11, 12......99} - {11,22,33,44,55,66,77,88,99}

12x=1*10^2+2*10+x

5x3=5*10^2+x*10+3

xy=x*10+y

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