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第42页

信息发布者：

$\frac {3}{5}，\frac {1}{8}，\frac {7}{13}$

$\frac {7}{4}，\frac {6}{6}，\frac {16}{8}，\frac {9}{9}，$

$\frac {21}{12}$

$\frac {13}{10}$

$\frac {1}{6}$

$\frac {1}{12}$

$\frac {1}{10}$

$\frac {1}{7}，\frac {2}{7}，\frac {3}{7}，\frac {4}{7}，\frac {5}{7}，\frac {6}{7}$

$\frac {7}{7}，\frac {8}{7}，\frac {9}{7}，\frac {10}{7}，\frac {11}{7}....$

$\frac {1}{6}，\frac {2}{6}，\frac {3}{6}，\frac {4}{6}，\frac {5}{6}$

$\frac {6}{1}，\frac {6}{2}，\frac {6}{3}，\frac {6}{4}，\frac {6}{5}，\frac {6}{6}$

$\frac {6}{7}$

$\frac {7}{7}$

小王用时：$13+4=17($分钟)

$ 13÷17=\frac {13}{17}$

$ 17÷13=\frac {17}{13}$

答：小李用时是小王的$ \frac {13}{17}，$小王用时是小李的$ \frac {17}{13}.$

$1-\frac 13=\frac 23$

$ \frac 23×\frac 12=\frac 13$

$ \frac 13+\frac 13=\frac 23$

答：两次一共裁去这张纸的$ \frac 23.$