$$\frac { 2.5 \times 2.5 + 2 \times 3.75 + 1.5 \times 1.5 } { 2.5 + 1.5 }$$
$4$
$$\frac{6.25+2\times 3.75+1.5\times 1.5}{2.5+1.5}$$
$$\frac{6.25+7.5+1.5\times 1.5}{2.5+1.5}$$
$$\frac{13.75+1.5\times 1.5}{2.5+1.5}$$
$$\frac{13.75+2.25}{2.5+1.5}$$
$$\frac{16}{2.5+1.5}$$
$$\frac{16}{4}$$
$$4$$
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$2^{2}$
