$$25 - \frac { 1 } { 2 } \{ 5 + 4 - ( 8 + 2 - \frac { 1 + 3 } { 1 + 3 } ) \}$$
$25$
$$25-\frac{1}{2}\left(5+4-\left(8+2-1\right)\right)$$
$$25-\frac{1}{2}\left(9-\left(8+2-1\right)\right)$$
$$25-\frac{1}{2}\left(9-\left(10-1\right)\right)$$
$$25-\frac{1}{2}\left(9-9\right)$$
$$25-\frac{1}{2}\times 0$$
$$25-0$$
$$25$$
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$5^{2}$
