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خطا

$OM\parallel AB\Rightarrow \frac{2}{x+2}=\frac{n}{8}$ $ON\parallel CD\Rightarrow \frac{6}{10}=\frac{m}{10}\Rightarrow m=6$ $CD\parallel AB\parallel MN\Rightarrow \frac{x}{2}=\frac{6}{4}\Rightarrow x=3$ $\Rightarrow \frac{2}{5}=\frac{n}{8}\Rightarrow n=3/2\Rightarrow x+y=3+(3/2+6)=12/2$