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13

$\frac{1}{12}$

$\frac{1}{8}$

$\frac{1}{4}$

$1-\frac{63}{64}$

0

$\frac{25}{33}$

11

21

$10分鐘=\frac{1}{6}小時(shí)$

$\frac{5}{7}-\frac{1}{6}+\frac{5}{7}=\frac{53}{42}(小時(shí))$

$答：這名游客上山、下山共用了\frac{53}{42}小時(shí)。$

$\frac{11}{12}-(\frac{1}{4}+\frac{1}{4}+\frac{1}{6})=\frac{1}{4}(噸)$

$答：原來乙倉庫存糧\frac{1}{4}噸。$

$1-(\frac{1}{2}+\frac{1}{4}+\frac{1}{8} +\frac{1}{16})$

$ \begin{aligned} &=1-(1-\frac{1}{16}) \\ &=\frac{1}{16} \\ \end{aligned}$

$答：還?？倲?shù)的\frac{1}{16}。$

$因?yàn)閇19,5]=95$

$\frac{x}{19}＜\frac{4}{5}＜\frac{y}{19}$

$可以改寫為\frac{5x}{95}＜\frac{76}{95}＜\frac{5y}{95}$

$5x＜76＜5y$

$所以x=15，y=16。$

（更多請(qǐng)點(diǎn)擊查看作業(yè)精靈詳解）

$三個(gè)分?jǐn)?shù)的分母不可能都比3大，如果有兩個(gè)$

$分?jǐn)?shù)分別是\frac{1}{2}和\frac{1}{3}$

$那么另一個(gè)分?jǐn)?shù)就是$

$1-\frac{1}{2}-\frac{1}{3}=\frac{1}{6}$

$所以\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=1$

$~~~~\frac{1}{2}+\frac{3}{4}+\frac{7}{8}+\frac{15}{16}+\frac{31}{32}+\frac{63}{64}+\frac{127}{128}+\frac{255}{256}$

$= 1-(\frac{1}{2})+(1- \frac{1}{4} )+(1- \frac{1}{8} )+···+ (1-\frac{1}{256})$

$=8-( \frac{1}{2} +\frac{1}{4}+\frac{1}{8}+···+\frac{1}{256})$

$=8-(1-\frac{1}{256} )$

$=8-1+ \frac{1}{256}$

$=7 \frac{1}{256}$

$~~~~\frac{1}{2}+\frac{1}{3}+\frac{2}{3}+\frac{1}{4}+\frac{2}{4}+\frac{3}{4}+\frac{1}{5}+\frac{2}{5}+···+\frac{1}{10}$

$~~~~+\frac{2}{10}+···+\frac{9}{10}$

$=0.5+1+1.5+2+···+4.5$

$=(0.5+4.5)×9÷2$

$=22.5$

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