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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
