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1. 直接写出得数。
$\frac{3}{5} × 12 =$
$5.5 × \frac{3}{11} =$
$\frac{2}{7} × \frac{1}{3} =$
$\frac{14}{15} × \frac{1}{42} =$
$\frac{17}{20} × \frac{5}{34} =$
$\frac{3}{4} × \frac{1}{2} × 8 =$
$\frac{3}{5} × 12 =$
$5.5 × \frac{3}{11} =$
$\frac{2}{7} × \frac{1}{3} =$
$\frac{14}{15} × \frac{1}{42} =$
$\frac{17}{20} × \frac{5}{34} =$
$\frac{3}{4} × \frac{1}{2} × 8 =$
答案
1. $\frac{36}{5}$ 1.5 $\frac{2}{21}$ $\frac{1}{45}$ $\frac{1}{8}$ 3
2. 计算下面各题，能用简便算法的就用简便算法。
$6×(\dfrac{1}{6}+\dfrac{2}{3})$ $\dfrac{5}{6}×\dfrac{3}{4}+\dfrac{5}{6}×\dfrac{1}{4}$ $\dfrac{4}{5}×\dfrac{1}{7}×\dfrac{5}{4}×7$
$6×(\dfrac{1}{6}+\dfrac{2}{3})$ $\dfrac{5}{6}×\dfrac{3}{4}+\dfrac{5}{6}×\dfrac{1}{4}$ $\dfrac{4}{5}×\dfrac{1}{7}×\dfrac{5}{4}×7$
答案
2. 5 $\frac{5}{6}$ 1
3.学校举行阅读活动，小丽上星期一共读了200页书，小明读的页数是小丽的$\frac{6}{5}$，小林读的页数是小明的$\frac{7}{8}$，小林读了（
210
）页书。答案
3. 210
