1. 直接写出得数。
$\frac{3}{5} × 12 =$
$5.5 × \frac{3}{11} =$
$\frac{2}{7} × \frac{1}{3} =$
$\frac{14}{15} × \frac{1}{42} =$
$\frac{17}{20} × \frac{5}{34} =$
$\frac{3}{4} × \frac{1}{2} × 8 =$

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。
$6×(\dfrac{1}{6}+\dfrac{2}{3})$
$\dfrac{5}{6}×\dfrac{3}{4}+\dfrac{5}{6}×\dfrac{1}{4}$
$\dfrac{4}{5}×\dfrac{1}{7}×\dfrac{5}{4}×7$

2.5 $\frac{5}{6}$ 1