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1. 看谁算得又对又快。
$1 × \dfrac{2}{3} =$ $\dfrac{5}{4} × \dfrac{1}{4} =$ $\dfrac{4}{3} × 5 =$
$21 × \dfrac{8}{7} =$ $\dfrac{6}{7} × \dfrac{5}{6} =$ $\dfrac{1}{2} × \dfrac{2}{3} =$
$1 × \dfrac{2}{3} =$ $\dfrac{5}{4} × \dfrac{1}{4} =$ $\dfrac{4}{3} × 5 =$
$21 × \dfrac{8}{7} =$ $\dfrac{6}{7} × \dfrac{5}{6} =$ $\dfrac{1}{2} × \dfrac{2}{3} =$
答案：
$\dfrac{2}{3}$；$\dfrac{5}{16}$；$\dfrac{20}{3}$；24；$\dfrac{5}{7}$；$\dfrac{1}{3}$
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