$$3\frac{1}{4}-2\frac{3}{5}$$
$\frac{13}{20}=0.65$
$$\frac{12+1}{4}-\frac{2\times 5+3}{5}$$
$$\frac{13}{4}-\frac{2\times 5+3}{5}$$
$$\frac{13}{4}-\frac{10+3}{5}$$
$$\frac{13}{4}-\frac{13}{5}$$
$$\frac{65}{20}-\frac{52}{20}$$
$$\frac{65-52}{20}$$
$$\frac{13}{20}$$
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$\frac{13}{2 ^ {2} \cdot 5} = 0.65$
