\(\overline{34x5y}⋮36\Leftrightarrow\overline{34x5y}⋮4;9\)
Ta có: \(\overline{34x5y}⋮4\Leftrightarrow\overline{5y}⋮4\Leftrightarrow y\in\left\{2;6\right\}\)
+ Nếu y = 2 thì ta có \(\overline{34x52}⋮9\Leftrightarrow3+4+x+5+2=14+x⋮9\Leftrightarrow x=4\)
+ Nếu y = 6 thì ta có \(\overline{34x56}⋮9\Leftrightarrow3+4+x+5+6=18+x⋮9\Leftrightarrow x\in\left\{0;9\right\}\)
Vậy, (x, y) = {(4, 2); (6, 0); (6, 9)}.