$$4 a ^ { 0 } + 4 ^ { - 1 }$$
$\frac{17}{4}=4.25$
$$4\times 1+4^{-1}$$
$$4+4^{-1}$$
$$4+\frac{1}{4}$$
$$\frac{17}{4}$$
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$\frac{17}{2 ^ {2}} = 4\frac{1}{4} = 4.25$
$$\frac{16a^{0}+1}{4}$$