1. 直接写出得数。(20☆)
$\frac{3}{8}×7=$
$0.45×\frac{7}{9}=$
$\frac{21}{26}×\frac{13}{14}=$
$\frac{1}{6}×27=$
$\frac{6}{11}×\frac{7}{9}=$
$\frac{9}{22}×\frac{11}{9}=$
$\frac{8}{13}×\frac{11}{16}=$
$20.4×\frac{1}{6}=$
$\frac{8}{15}×\frac{15}{16}=$
$\frac{5}{14}×0.8=$
$19×\frac{5}{19}=$
$35.2×\frac{1}{8}=$
$24×\frac{5}{12}=$
$\frac{5}{7}-\frac{8}{21}=$
$7.5×\frac{2}{3}=$
$\frac{1}{4}×16.8=$
$\frac{4}{15}+\frac{4}{9}=$
$4×\frac{7}{12}=$
$32×\frac{3}{40}=$
$\frac{1}{5}×6.5=$

$\frac{21}{8}$
$\frac{7}{20}$
$\frac{3}{4}$
$\frac{9}{2}$
$\frac{14}{33}$
$\frac{1}{2}$
$\frac{11}{26}$
$\frac{17}{5}$
$\frac{1}{2}$
$\frac{2}{7}$
$5$
$\frac{22}{5}$
$10$
$\frac{1}{3}$
$5$
$\frac{21}{5}$
$\frac{32}{45}$
$\frac{7}{3}$
$\frac{12}{5}$
$\frac{13}{10}$

2. 先计算出每组算式的结果,再在$◯$里填上“＞”“＜”或“=”。(9☆)
$1÷7=(\quad)$
$6÷4=(\quad)$
$8÷3=(\quad)$
$1×\frac{1}{7}=(\quad)$
$6×\frac{1}{4}=(\quad)$
$8×\frac{1}{3}=(\quad)$
$1÷7 ◯ 1×\frac{1}{7}$
$6÷4 ◯ 6×\frac{1}{4}$
$8÷3 ◯ 8×\frac{1}{3}$

$1÷7=\frac{1}{7}$
$6÷4=\frac{3}{2}$
$8÷3=\frac{8}{3}$
$1×\frac{1}{7}=\frac{1}{7}$
$6×\frac{1}{4}=\frac{3}{2}$
$8×\frac{1}{3}=\frac{8}{3}$
$1÷7 = 1×\frac{1}{7}$
$6÷4 = 6×\frac{1}{4}$
$8÷3 = 8×\frac{1}{3}$

3. 填一填。（9☆）
$\frac{3}{4}×( )=1$
$\frac{7}{2}×( )=1$
$( )×0.35=1$
$2.5×( )=1$
$( )×\frac{14}{9}=1$
$\frac{6}{7}×( )=1$
$\frac{2}{5}×( )=1$
$0.3×( )=1$
$\frac{6}{5}×( )=1$

$\frac{3}{4}×\frac{4}{3}=1$
$\frac{7}{2}×\frac{2}{7}=1$
$\frac{20}{7}×0.35=1$
$2.5×\frac{2}{5}=1$
$\frac{9}{14}×\frac{14}{9}=1$
$\frac{6}{7}×\frac{7}{6}=1$
$\frac{2}{5}×\frac{5}{2}=1$
$0.3×\frac{10}{3}=1$
$\frac{6}{5}×\frac{5}{6}=1$

4. 计算下面各题,能简算的要简算。(12☆)
$8.5×\frac{4}{5}+0.2×8.5$
$24×(\frac{1}{4}+\frac{1}{6}-\frac{1}{3})$
$\frac{3}{17}×\frac{7}{8}+0.125×\frac{3}{17}$
用时：分钟 共得：☆/50 ☆

$8.5×\frac{4}{5}+0.2×8.5=8.5$
$24×(\frac{1}{4}+\frac{1}{6}-\frac{1}{3})=2$
$\frac{3}{17}×\frac{7}{8}+0.125×\frac{3}{17}=\frac{3}{17}$