题目

When is your school t, Mary? 答案：【1】trip3．$\frac{5}{12}$小时=25分；          $\frac{9}{10}$米的$\frac{2}{3}$是$\frac{3}{5}$米；          $\frac{1}{4}$公顷的  $\frac{4}{5}$是$\frac{1}{5}$公顷．