$$( \frac{ 5 }{ 7 } + \frac{ 3 }{ 5 } ) \times ( 1 \frac { 3 } { 5 } - 1 \frac { 1 } { 4 } )=$$
$\frac{23}{50}=0.46$
$$\left(\frac{25}{35}+\frac{21}{35}\right)\left(\frac{1\times 5+3}{5}-\frac{1\times 4+1}{4}\right)$$
$$\frac{25+21}{35}\left(\frac{1\times 5+3}{5}-\frac{1\times 4+1}{4}\right)$$
$$\frac{46}{35}\left(\frac{1\times 5+3}{5}-\frac{1\times 4+1}{4}\right)$$
$$\frac{46}{35}\left(\frac{5+3}{5}-\frac{1\times 4+1}{4}\right)$$
$$\frac{46}{35}\left(\frac{8}{5}-\frac{1\times 4+1}{4}\right)$$
$$\frac{46}{35}\left(\frac{8}{5}-\frac{4+1}{4}\right)$$
$$\frac{46}{35}\left(\frac{8}{5}-\frac{5}{4}\right)$$
$$\frac{46}{35}\left(\frac{32}{20}-\frac{25}{20}\right)$$
$$\frac{46}{35}\times \frac{32-25}{20}$$
$$\frac{46}{35}\times \frac{7}{20}$$
$$\frac{46\times 7}{35\times 20}$$
$$\frac{322}{700}$$
$$\frac{23}{50}$$
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$\frac{23}{2 \cdot 5 ^ {2}} = 0.46$
