$$A= \frac{ 9 }{ 10 } /| \frac{ 10 }{ 11 } /| \frac{ 11 }{ 12 }$$
$A=\frac{363}{400}=0.9075$
$$A=\frac{\frac{9}{10}}{|\frac{\frac{10}{11}}{\frac{11}{12}}|}$$
$$A=\frac{\frac{9}{10}}{|\frac{10}{11}\times \frac{12}{11}|}$$
$$A=\frac{\frac{9}{10}}{|\frac{10\times 12}{11\times 11}|}$$
$$A=\frac{\frac{9}{10}}{|\frac{120}{121}|}$$
$$A=\frac{\frac{9}{10}}{\frac{120}{121}}$$
$$A=\frac{9}{10}\times \frac{121}{120}$$
$$A=\frac{9\times 121}{10\times 120}$$
$$A=\frac{1089}{1200}$$
$$A=\frac{363}{400}$$
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$A≔\frac{363}{400}$
