$$3 \frac { 4 } { 7 } 1 \frac { 5 } { 4 }$$
$\frac{225}{28}\approx 8.035714286$
$$\frac{21+4}{7}\times \frac{1\times 4+5}{4}$$
$$\frac{25}{7}\times \frac{1\times 4+5}{4}$$
$$\frac{25}{7}\times \frac{4+5}{4}$$
$$\frac{25}{7}\times \frac{9}{4}$$
$$\frac{25\times 9}{7\times 4}$$
$$\frac{225}{28}$$
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$\frac{3 ^ {2} \cdot 5 ^ {2}}{2 ^ {2} \cdot 7} = 8\frac{1}{28} = 8.035714285714286$
