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第72頁

信息發(fā)布者：
?$1\frac{1}{4}$?
?$\frac{1}{10}$?
?$\frac{2}{5}$?
?$1\frac{1}{4}$?
?$解：\frac {9}{5}x=\frac {3}{10}$?
          ?$x=\frac {1}{6}$?
?$解：\frac {2}{9}x=\frac {5}{6}$?
          ?$x=\frac {15}{4}$?
?$解：\frac {5}{4}x=\frac {11}{6}$?
          ?$x=\frac {22}{15}$?
?$ =\frac {3}{7}×\frac {4}{5}+\frac {4}{7}×\frac {5}{4}$?
?$ =(\frac {3}{7}+\frac {4}{7})×\frac {4}{5}$?
?$ =1×\frac {4}{5}$?
?$ =\frac {4}{5}$?
?$ =1-\frac {2}{3}÷\frac {2}{3}$?
?$ =1-1$?
?$ =0$?
?$ =\frac {3}{5}÷\frac {3}{2}×\frac {12}{7}$?
?$ =\frac {2}{5}×\frac {12}{7}$?
?$ =\frac {24}{35}$?
?$6×\frac {2}{5}÷\frac {3}{10}=8($?千米?$)$?
答?$：$?平均每小時跑?$8$?千米。
?$15×(1-\frac 35)÷6=1($?千克?$)$?
答：每個瓶子裝?$1$?千克油。
?$ \frac {175}{6}$?
?$\frac {11}{4}$?
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