$$2\frac{1}{4}\times5=$$
$\frac{45}{4}=11.25$
$$\frac{8+1}{4}\times 5$$
$$\frac{9}{4}\times 5$$
$$\frac{9\times 5}{4}$$
$$\frac{45}{4}$$
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$\frac{3 ^ {2} \cdot 5}{2 ^ {2}} = 11\frac{1}{4} = 11.25$
