$$\frac { 2 ^ { 40 } + 2 ^ { 39 } + 2 ^ { 38 } } { 2 ^ { 41 } + 2 ^ { 40 } - 2 ^ { 39 } }$$
$\frac{7}{10}=0.7$
$$\frac{1099511627776+2^{39}+2^{38}}{2^{41}+2^{40}-2^{39}}$$
$$\frac{1099511627776+549755813888+2^{38}}{2^{41}+2^{40}-2^{39}}$$
$$\frac{1649267441664+2^{38}}{2^{41}+2^{40}-2^{39}}$$
$$\frac{1649267441664+274877906944}{2^{41}+2^{40}-2^{39}}$$
$$\frac{1924145348608}{2^{41}+2^{40}-2^{39}}$$
$$\frac{1924145348608}{2199023255552+2^{40}-2^{39}}$$
$$\frac{1924145348608}{2199023255552+1099511627776-2^{39}}$$
$$\frac{1924145348608}{3298534883328-2^{39}}$$
$$\frac{1924145348608}{3298534883328-549755813888}$$
$$\frac{1924145348608}{2748779069440}$$
$$\frac{7}{10}$$
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$\frac{7}{2 \cdot 5} = 0.7$
