电子课本网 第38页

第38页

信息发布者:
$=\frac {7}{8}×\frac {4}{3}×\frac {24}{7}$
$=4$
$=\frac {2}{3}×\frac {4}{7}×\frac {7}{3}$
$=\frac {8}{9}$
$=\frac {1}{5}×\frac {1}{2}×\frac {5}{2}$
$=\frac {1}{4}$
$ =\frac {8}{9}×\frac {13}{12}×\frac {27}{26}$
$=1$
20
9
45
$ \frac {5}{9}$
$ \frac {9}{5}$
$ \frac {81}{80}$
3:7
B
$ \frac {4}{9}÷\frac {10}{9}=\frac {2}{5}(分钟)$
$答:需要\frac {2}{5}分钟。$
16
$=125:750$
$=1:6$
$=\frac {1}{6}$
$=4:3$
$=\frac {4}{3}$
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$\ \frac {4}{9}÷\frac {2}{5}=\frac {10}{9}(千米)$
$答:每分钟能行驶\frac {10}{9}千米。$
$\ \frac {10}{9}×\frac {2}{5}=\frac {4}{9}(千米)$
$答:行驶了\frac {4}{9}千米。$