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第42頁

信息發(fā)布者：
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10
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?$\frac {3}{5}，\frac {1}{8}，\frac {7}{13}$?
?$\frac {7}{4}，\frac {6}{6}，\frac {16}{8}，\frac {9}{9}，$?
?$\frac {21}{12}$?

?$\frac {13}{10}$?
?$\frac {1}{6}$?
15
?$\frac {1}{12}$?
?$\frac {1}{10}$?
7
?$\frac {1}{7}，\frac {2}{7}，\frac {3}{7}，\frac {4}{7}，\frac {5}{7}，\frac {6}{7}$?
?$\frac {7}{7}，\frac {8}{7}，\frac {9}{7}，\frac {10}{7}，\frac {11}{7}....$?
?$\frac {1}{6}，\frac {2}{6}，\frac {3}{6}，\frac {4}{6}，\frac {5}{6}$?
?$\frac {6}{1}，\frac {6}{2}，\frac {6}{3}，\frac {6}{4}，\frac {6}{5}，\frac {6}{6}$?
?$\frac {6}{7}$?
?$\frac {7}{7}$?
小王用時(shí)：$13+4=17($分鐘)
$ 13÷17=\frac {13}{17}$
$ 17÷13=\frac {17}{13}$
答：小李用時(shí)是小王的$ \frac {13}{17}，$小王用時(shí)是小李的$ \frac {17}{13}.$
?$1-\frac 13=\frac 23$?
?$ \frac 23×\frac 12=\frac 13$?
?$ \frac 13+\frac 13=\frac 23$?
答：兩次一共裁去這張紙的?$ \frac 23.$
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