第72页 - 苏教版六年级伴你学数学答案（上下册）

$1\frac{1}{4}$

$\frac{1}{10}$

$\frac{2}{5}$

$1\frac{1}{4}$

$解：\frac {9}{5}x=\frac {3}{10}$

$x=\frac {1}{6}$

$解：\frac {2}{9}x=\frac {5}{6}$

$x=\frac {15}{4}$

$解：\frac {5}{4}x=\frac {11}{6}$

$x=\frac {22}{15}$

$ =\frac {3}{7}×\frac {4}{5}+\frac {4}{7}×\frac 45$

$ =(\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$：$平均每小时跑$8$千米。

$15×(1-\frac 35)÷6=1($千克$)$

答：每个瓶子装$1$千克油。

$ \frac {175}{6}$

$\frac {11}{4}$