$$12\div144\times3+2-1$$
$\frac{5}{4}=1.25$
$$\frac{1}{12}\times 3+2-1$$
$$\frac{3}{12}+2-1$$
$$\frac{1}{4}+2-1$$
$$\frac{1}{4}+\frac{8}{4}-1$$
$$\frac{1+8}{4}-1$$
$$\frac{9}{4}-1$$
$$\frac{9}{4}-\frac{4}{4}$$
$$\frac{9-4}{4}$$
$$\frac{5}{4}$$
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$\frac{5}{2 ^ {2}} = 1\frac{1}{4} = 1.25$