1. 直接写出得数。
实际用时：分钟
$\frac{5}{4}×\frac{12}{5}=$ $\frac{21}{4}×\frac{8}{7}=$ $3-\frac{3}{5}=$ $\frac{5}{8}÷1=$
$\frac{5}{6}-\frac{2}{3}=$ $\frac{2}{3}×\frac{3}{4}=$ $\frac{1}{6}×3=$ $\frac{4}{5}×\frac{1}{2}=$
$\frac{6}{7}÷6=$ $\frac{7}{11}×1\frac{4}{7}=$ $\frac{6}{7}×\frac{3}{5}=$ $\frac{6}{5}×\frac{4}{3}=$
$\frac{2}{5}÷\frac{1}{2}=$ $\frac{5}{12}×\frac{9}{10}=$ $\frac{33}{13}÷22=$ $34×\frac{19}{51}=$
$\frac{3}{10}÷\frac{5}{6}=$ $\frac{22}{39}×\frac{26}{11}=$ $8÷\frac{8}{13}=$ $\frac{13}{7}÷26=$
$\frac{7}{11}÷14=$ $1÷\frac{3}{7}=$ $\frac{11}{15}×\frac{25}{44}=$ $90÷\frac{9}{10}=$

1. $3\quad 6\quad \frac{12}{5}\quad \frac{5}{8}$
$\frac{1}{6}\quad \frac{1}{2}\quad \frac{1}{2}\quad \frac{2}{5}$
$\frac{1}{7}\quad 1\quad \frac{18}{35}\quad \frac{8}{5}$
$\frac{4}{5}\quad \frac{3}{8}\quad \frac{3}{26}\quad \frac{38}{3}$
$\frac{9}{25}\quad \frac{4}{3}\quad 13\quad \frac{1}{14}$
$\frac{1}{22}\quad \frac{7}{3}\quad \frac{5}{12}\quad 100$

2. 计算下面各题。
$9×\frac{5}{9}+\frac{1}{19}+\frac{10}{19}$
$36×(\frac{4}{9}+\frac{5}{12})$
$\frac{1}{8}÷[\frac{1}{8}×(1+\frac{2}{5})]$

2. $\frac{106}{19}\quad 31\quad \frac{5}{7}$

3. 在()里填上合适的数。
():6=15
():5=0.3
$\frac{3}{4}$:()=$\frac{1}{2}$
4:()=0.5
():$\frac{1}{12}$=$\frac{3}{5}$
4.5:()=$\frac{5}{8}$
$\frac{20}{( )}$=5
():14=$\frac{5}{7}$
6:11=()÷77

3. $90\quad 1.5\quad \frac{3}{2}$
$8\quad \frac{1}{20}\quad \frac{36}{5}$
$4\quad 10\quad 42$

计算：$(1+\dfrac{1}{2}+\dfrac{1}{3})×(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4})-(1+\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4})×(\dfrac{1}{2}+\dfrac{1}{3})$

$\frac{1}{4}$