$$2 \frac { 4 } { 5 } 1 \frac { 3 } { 4 } 7 ?$$
$\frac{343}{10}=34.3$
$$\frac{10+4}{5}\times \frac{1\times 4+3}{4}\times 7$$
$$\frac{14}{5}\times \frac{1\times 4+3}{4}\times 7$$
$$\frac{14}{5}\times \frac{4+3}{4}\times 7$$
$$\frac{14}{5}\times \frac{7}{4}\times 7$$
$$\frac{14\times 7}{5\times 4}\times 7$$
$$\frac{98}{20}\times 7$$
$$\frac{49}{10}\times 7$$
$$\frac{49\times 7}{10}$$
$$\frac{343}{10}$$
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$\frac{7 ^ {3}}{2 \cdot 5} = 34\frac{3}{10} = 34.3$
