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電子課本網(wǎng) 第42頁

第42頁

信息發(fā)布者:
?$ \frac {3}{2}$?
?$ \frac {4}{3}$?
$\frac{2}{9}$
÷



=
解:?$24x=\frac {3}{8}$?
?$x=\frac {3}{8}÷24$?
?$x=\frac {3}{8}×\frac {1}{24}$?
?$x=\frac {1}{64}$?
解:?$\frac {3}{8}x=\frac {9}{10}$?
?$x=\frac {9}{10}÷\frac {3}{8}$?
?$x=\frac {9}{10}×\frac {8}{3}$?
?$x=\frac {12}{5}$?
解:?$\frac {3}{11}x=\frac {9}{22}$?
?$x=\frac {9}{22}÷\frac {3}{11}$?
?$x=\frac {9}{22}×\frac {11}{3}$?
?$x=\frac {3}{2}$?
解:?$\frac {9}{4}÷\frac {3}{8}=\frac {9}{4}×\frac {8}{3}=6($?袋?$)$?
答:可以裝?$6$?袋。
解:?$\frac {4}{5}÷\frac {1}{10}=\frac {4}{5}×10=8($?副?$)$?
答:可以織?$8$?副。
解:平均每小時走:?$\frac {5}{16}÷\frac {1}{10}=\frac {5}{16}×10=\frac {25}{8}($?千米?$)$?
走?$1$?千米需要:?$\frac {1}{10}÷\frac {5}{16}=\frac {1}{10}×\frac {16}{5}=\frac {8}{25}($?小時?$)$?
答:平均每小時走?$\frac {25}{8}$?千米,走?$1$?千米需要?$\frac {8}{25}$?小時。