第53页

信息发布者:
$\boldsymbol{\frac{3}{10}}$
$\boldsymbol{\frac{5}{12}}$
$\boldsymbol{\frac{2}{3}}$
$\boldsymbol{\frac{1}{14}}$
$\boldsymbol{\frac{5}{8}}$
$\boldsymbol{\frac{2}{5}}$
​$=\frac {9}{4}+(\frac {1}{12}+\frac {11}{12})$​
​$ =\frac {9}{4}+1$​
​$ =\frac {13}{4}$​
​$=\frac {6}{7}-\frac {5}{7}-\frac {1}{14}$​
​$ =\frac {1}{7}-\frac {1}{14}$​
​$ =\frac {1}{14}$​
​$=2-(\frac {6}{11}+\frac {5}{11})$​
​$ =2-1$​
​$ =1$​
​$=\frac {5}{9}+\frac {4}{9}-\frac {3}{5}$​
​$ =1-\frac {3}{5}$​
​$ =\frac {2}{5}$​
​$=(\frac {10}{17}+\frac {7}{17})+(\frac {1}{6}+\frac {5}{6})$​
​$ =1+1$​
​$ =2$​
​$=(\frac {13}{11}-\frac {2}{11})-(\frac {3}{5}+\frac {2}{5})$​
​$ =1-1$​
​$ =0$​
$\frac{1}{2}-\frac{1}{5}-\frac{1}{6}$
$=\frac{15}{30}-\frac{6}{30}-\frac{5}{30}$
$=\frac{4}{30}$
$=\frac{2}{15}$(吨)
答:还剩$\frac{2}{15}$吨没有卖。
$1-\frac{1}{5}-\frac{1}{6}$
$=1-\frac{6}{30}-\frac{5}{30}$
$=\frac{19}{30}$
答:还剩总数的$\frac{19}{30}$没有卖。
菠菜和大白菜的种植面积一
共占菜园面积的几分之几?
$1-(\frac{1}{9}+\frac{1}{3}+\frac{1}{9})$
$=1-(\frac{1}{9}+\frac{3}{9}+\frac{1}{9})$
$=1-\frac{5}{9}$
$=\frac{4}{9}$
答:最多占菜园面积的$\frac{4}{9}。$
$\frac{4}{7}+\frac{3}{5}-1$
$=\frac{20}{35}+\frac{21}{35}-1$
$=\frac{41}{35}-1$
$=\frac{6}{35}$
答:超额完成了计划的$\frac{6}{35}。$
$\frac{7}{9}+\frac{4}{5}+\frac{1}{10}-1$
$=\frac{70}{90}+\frac{72}{90}+\frac{9}{90}-1$
$=\frac{151}{90}-1$
$=\frac{61}{90}$
答:文学类的书占$\frac{61}{90}。$