1. 填空。

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2.
答案:
3. 计算。
$\frac{1}{6}\times\frac{2}{5}\times\frac{3}{4}$ $\frac{7}{8}\times\frac{3}{10}\times\frac{2}{9}$ $\frac{5}{7}\times56\times\frac{3}{8}$
$12\times\frac{5}{6}\times\frac{7}{8}$ $34\times\frac{5}{17}\times\frac{2}{15}$ $\frac{13}{28}\times\frac{7}{26}\times\frac{1}{3}$
$\frac{1}{6}\times\frac{2}{5}\times\frac{3}{4}$ $\frac{7}{8}\times\frac{3}{10}\times\frac{2}{9}$ $\frac{5}{7}\times56\times\frac{3}{8}$
$12\times\frac{5}{6}\times\frac{7}{8}$ $34\times\frac{5}{17}\times\frac{2}{15}$ $\frac{13}{28}\times\frac{7}{26}\times\frac{1}{3}$
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