$$A = 0 , 75 : ( \frac { 2 } { 5 } + \frac { 3 } { 4 } ) \cdot 1 \frac { 8 } { 15 }$$
$a=100$
$$a=\frac{75}{\frac{23}{20}}\times \frac{1\times 15+8}{15}$$
$$a=75\times \frac{20}{23}\times \frac{1\times 15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{1\times 15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{23}{15}$$
$$a=100$$
$$A=0$$ $$a=100$$
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