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信息发布者:

$\frac{3}{7} \times 2 = \frac{6}{7}$
$\frac{3}{16} \times 3 = \frac{9}{16}$
= $\frac{7}{3}$ 
= $\frac{2}{3}$
=25
= $\frac{7}{2}$
$\frac{1}{5} \times 3 = \frac{3}{5}$(千米)
$答:第二天修了\frac {3}{5}千米。$
$\frac {1}{6}×5=\frac {5}{6}$
$1-\frac {5}{6}=\frac {1}{6}$
答: 5天一共吃$\frac{5}{6},$还剩$\frac{1}{6}$。
$\frac{1}{4}$
100
25
$\frac{1}{8}$
40
5