$$A=0,75:(\frac{2}{5}+\frac{3}{4})\cdot1\frac{8}{15}; B=(0,5:\frac{2}{5}+\frac{3}{4})\cdot\frac{2}{9}; A-B=; A\cdot B=$$
$a=100$
$$a=\frac{75}{\frac{23}{20}}\times \frac{1\times 15+8}{15}$$
$$a=75\times \frac{20}{23}\times \frac{1\times 15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{1\times 15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{15+8}{15}$$
$$a=\frac{1500}{23}\times \frac{23}{15}$$
$$a=100$$
$$A=0$$ $$a=100$$
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