$$\frac{ { 0.4 }^{ 2 } -1.6 \times 0.8+ { 1.6 }^{ 2 } }{ { 1.6 }^{ 2 } - { 0.4 }^{ 2 } }$$
$0.6$
$$\frac{0.16-1.6\times 0.8+1.6^{2}}{1.6^{2}-0.4^{2}}$$
$$\frac{0.16-1.28+1.6^{2}}{1.6^{2}-0.4^{2}}$$
$$\frac{-1.12+1.6^{2}}{1.6^{2}-0.4^{2}}$$
$$\frac{-1.12+2.56}{1.6^{2}-0.4^{2}}$$
$$\frac{1.44}{1.6^{2}-0.4^{2}}$$
$$\frac{1.44}{2.56-0.4^{2}}$$
$$\frac{1.44}{2.56-0.16}$$
$$\frac{1.44}{2.4}$$
$$\frac{144}{240}$$
$$\frac{3}{5}$$
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$\frac{3}{5} = 0.6$
