第72页 - 苏教版六年级伴你学数学答案（上下册）

$1\frac{1}{4}$

$\frac{1}{10}$

$\frac{2}{5}$

$1\frac{1}{4}$

$解：\frac {9}{5}x=\frac {3}{10}$

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

$解：\frac {2}{9}x=\frac {5}{6}$

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

$解：\frac {5}{4}x=\frac {11}{6}$

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

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

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

$=1×\frac {4}{5}$

$=\frac {4}{5}$

$=1-\frac {2}{3}÷\frac {2}{3}$

$=1-1$

$=0$

$=\frac {3}{5}÷\frac {3}{2}×\frac {12}{7}$

$=\frac {2}{5}×\frac {12}{7}$

$=\frac {24}{35}$

$6×\frac{2}{5}÷\frac{3}{10}=8(千米)$

$答:平均每小时跑8千米。$

$15×\frac {3}{5}÷6=1.5(千克)$

$答：每个瓶子装1.5千克油。$

$\frac {175}{6}$

$\frac {11}{4}$