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    $\frac{7}{8} \times \frac{9}{10} \bigcirc \frac{9}{10}$
    $\frac{8}{9} \div \frac{2}{3} \bigcirc 150 \% \times \frac{8}{9}$
    $\frac{13}{20} \div \frac{1}{4}$
    $\frac{13}{20} \div 4$
$<=>$