$$\frac{ { 0.2 }^{ 2 } +2 \times 0.2 \times 0.3+ { 0.3 }^{ 2 } }{ 0.5 \times 0.4-0.5 \times 0.8 }$$
$-1.25$
$$\frac{0.04+2\times 0.2\times 0.3+0.3^{2}}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.04+0.4\times 0.3+0.3^{2}}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.04+0.12+0.3^{2}}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.16+0.3^{2}}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.16+0.09}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.25}{0.5\times 0.4-0.5\times 0.8}$$
$$\frac{0.25}{0.2-0.5\times 0.8}$$
$$\frac{0.25}{0.2-0.4}$$
$$\frac{0.25}{-0.2}$$
$$\frac{25}{-20}$$
$$-\frac{5}{4}$$
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