$$3 - \frac { 3 } { 4 } ( \frac { 3 } { 16 } - \frac { 4 } { 8 } )$$
$\frac{207}{64}=3.234375$
$$3-\frac{3}{4}\left(\frac{3}{16}-\frac{1}{2}\right)$$
$$3-\frac{3}{4}\left(\frac{3}{16}-\frac{8}{16}\right)$$
$$3-\frac{3}{4}\times \frac{3-8}{16}$$
$$3-\frac{3}{4}\left(-\frac{5}{16}\right)$$
$$3-\frac{3\left(-5\right)}{4\times 16}$$
$$3-\frac{-15}{64}$$
$$3-\left(-\frac{15}{64}\right)$$
$$3+\frac{15}{64}$$
$$\frac{192}{64}+\frac{15}{64}$$
$$\frac{192+15}{64}$$
$$\frac{207}{64}$$
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$\frac{3 ^ {2} \cdot 23}{2 ^ {6}} = 3\frac{15}{64} = 3.234375$
