$$3\frac{1}{2}-1\frac{3}{4}=$$
$\frac{7}{4}=1.75$
$$\frac{6+1}{2}-\frac{1\times 4+3}{4}$$
$$\frac{7}{2}-\frac{1\times 4+3}{4}$$
$$\frac{7}{2}-\frac{4+3}{4}$$
$$\frac{7}{2}-\frac{7}{4}$$
$$\frac{14}{4}-\frac{7}{4}$$
$$\frac{14-7}{4}$$
$$\frac{7}{4}$$
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$\frac{7}{2 ^ {2}} = 1\frac{3}{4} = 1.75$
