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一、直接写出得数。
$\frac{4}{5}×\frac{2}{3}=$ $\frac{3}{8}×\frac{7}{11}=$ $\frac{7}{8}×\frac{1}{4}=$ $\frac{3}{5}×\frac{10}{9}=$
$\frac{2}{9}×\frac{5}{7}=$ $\frac{5}{7}×\frac{9}{11}=$ $\frac{5}{6}×\frac{5}{4}=$ $9×\frac{2}{3}=$
$\frac{5}{8}×\frac{1}{3}=$ $\frac{7}{6}×\frac{1}{3}=$ $\frac{3}{10}×\frac{3}{5}=$ $4×\frac{3}{4}=$
$\frac{7}{9}×\frac{4}{5}=$ $\frac{3}{4}×\frac{5}{7}=$ $\frac{5}{6}×\frac{5}{7}=$ $12×\frac{1}{4}=$
$\frac{3}{4}×\frac{3}{5}=$ $\frac{2}{5}×\frac{4}{5}=$ $\frac{3}{10}×\frac{2}{7}=$ $\frac{3}{10}×\frac{5}{6}=$
$\frac{9}{14}×\frac{7}{18}=$ $\frac{2}{27}×\frac{3}{8}=$ $\frac{25}{48}×\frac{6}{35}=$ $36×\frac{5}{6}=$
$\frac{4}{7}×\frac{3}{4}=$ $150×\frac{5}{6}=$ $\frac{4}{15}×\frac{1}{4}=$ $2×\frac{27}{50}=$
$\frac{11}{32}×\frac{8}{33}=$ $\frac{3}{13}×\frac{26}{27}=$ $14×\frac{10}{21}=$ $\frac{7}{9}×\frac{5}{7}=$
$\frac{7}{8}×\frac{16}{21}=$ $\frac{7}{10}×\frac{9}{14}=$ $\frac{7}{13}×\frac{26}{49}=$ $6×\frac{7}{8}=$
$\frac{7}{8}×\frac{2}{7}=$ $\frac{4}{9}×\frac{3}{5}=$ $\frac{5}{9}×\frac{2}{15}=$ $\frac{7}{8}×\frac{4}{21}=$
$\frac{4}{5}×\frac{2}{3}=$ $\frac{3}{8}×\frac{7}{11}=$ $\frac{7}{8}×\frac{1}{4}=$ $\frac{3}{5}×\frac{10}{9}=$
$\frac{2}{9}×\frac{5}{7}=$ $\frac{5}{7}×\frac{9}{11}=$ $\frac{5}{6}×\frac{5}{4}=$ $9×\frac{2}{3}=$
$\frac{5}{8}×\frac{1}{3}=$ $\frac{7}{6}×\frac{1}{3}=$ $\frac{3}{10}×\frac{3}{5}=$ $4×\frac{3}{4}=$
$\frac{7}{9}×\frac{4}{5}=$ $\frac{3}{4}×\frac{5}{7}=$ $\frac{5}{6}×\frac{5}{7}=$ $12×\frac{1}{4}=$
$\frac{3}{4}×\frac{3}{5}=$ $\frac{2}{5}×\frac{4}{5}=$ $\frac{3}{10}×\frac{2}{7}=$ $\frac{3}{10}×\frac{5}{6}=$
$\frac{9}{14}×\frac{7}{18}=$ $\frac{2}{27}×\frac{3}{8}=$ $\frac{25}{48}×\frac{6}{35}=$ $36×\frac{5}{6}=$
$\frac{4}{7}×\frac{3}{4}=$ $150×\frac{5}{6}=$ $\frac{4}{15}×\frac{1}{4}=$ $2×\frac{27}{50}=$
$\frac{11}{32}×\frac{8}{33}=$ $\frac{3}{13}×\frac{26}{27}=$ $14×\frac{10}{21}=$ $\frac{7}{9}×\frac{5}{7}=$
$\frac{7}{8}×\frac{16}{21}=$ $\frac{7}{10}×\frac{9}{14}=$ $\frac{7}{13}×\frac{26}{49}=$ $6×\frac{7}{8}=$
$\frac{7}{8}×\frac{2}{7}=$ $\frac{4}{9}×\frac{3}{5}=$ $\frac{5}{9}×\frac{2}{15}=$ $\frac{7}{8}×\frac{4}{21}=$
答案
$\frac{8}{15}$ $\frac{21}{88}$ $\frac{7}{32}$ $\frac{2}{3}$ $\frac{10}{63}$ $\frac{45}{77}$ $\frac{25}{24}$ $6$ $\frac{5}{24}$ $\frac{7}{18}$
$\frac{9}{50}$ $3$ $\frac{28}{45}$ $\frac{15}{28}$ $\frac{25}{42}$ $3$ $\frac{9}{20}$ $\frac{8}{25}$ $\frac{3}{35}$ $\frac{1}{4}$ $\frac{1}{4}$
$\frac{1}{36}$ $\frac{5}{56}$ $30$ $\frac{3}{7}$ $125$ $\frac{1}{15}$ $\frac{27}{25}$ $\frac{1}{12}$ $\frac{2}{9}$ $\frac{20}{3}$
$\frac{5}{9}$ $\frac{2}{3}$ $\frac{9}{20}$ $\frac{2}{7}$ $\frac{21}{4}$ $\frac{1}{4}$ $\frac{4}{15}$ $\frac{2}{27}$ $\frac{1}{6}$
$\frac{9}{50}$ $3$ $\frac{28}{45}$ $\frac{15}{28}$ $\frac{25}{42}$ $3$ $\frac{9}{20}$ $\frac{8}{25}$ $\frac{3}{35}$ $\frac{1}{4}$ $\frac{1}{4}$
$\frac{1}{36}$ $\frac{5}{56}$ $30$ $\frac{3}{7}$ $125$ $\frac{1}{15}$ $\frac{27}{25}$ $\frac{1}{12}$ $\frac{2}{9}$ $\frac{20}{3}$
$\frac{5}{9}$ $\frac{2}{3}$ $\frac{9}{20}$ $\frac{2}{7}$ $\frac{21}{4}$ $\frac{1}{4}$ $\frac{4}{15}$ $\frac{2}{27}$ $\frac{1}{6}$
二、看图算一算。
1.
(
2.
(
1.
($\frac{2}{3}$
)×($\frac{1}{4}$
)=($\frac{1}{6}$
)2.
($\frac{3}{4}$
)×($\frac{2}{3}$
)=($\frac{1}{2}$
)答案
1. $\frac{2}{3}×\frac{1}{4}=\frac{1}{6}$
2. $\frac{3}{4}×\frac{2}{3}=\frac{1}{2}$
2. $\frac{3}{4}×\frac{2}{3}=\frac{1}{2}$
三、新考法 规律探究 先观察前三个算式的特点，再在$□$里填适当的分数。
$\frac{7}{2}+\frac{7}{5}=\frac{7}{2}×\frac{7}{5}$
$\frac{8}{3}+\frac{8}{5}=\frac{8}{3}×\frac{8}{5}$
$\frac{7}{3}+\frac{7}{4}=\frac{7}{3}×\frac{7}{4}$
$\frac{9}{2}+□=\frac{9}{2}×□$
$\frac{11}{5}+□=\frac{11}{5}×□$
$6+□=6×□$
1. 2. 3. 4.
5. 6. 7. 8.
$\frac{7}{2}+\frac{7}{5}=\frac{7}{2}×\frac{7}{5}$
$\frac{8}{3}+\frac{8}{5}=\frac{8}{3}×\frac{8}{5}$
$\frac{7}{3}+\frac{7}{4}=\frac{7}{3}×\frac{7}{4}$
$\frac{9}{2}+□=\frac{9}{2}×□$
$\frac{11}{5}+□=\frac{11}{5}×□$
$6+□=6×□$
1. 2. 3. 4.
5. 6. 7. 8.
答案
1.$\frac{9}{7}$ 2.$\frac{9}{7}$ 3.$\frac{11}{6}$ 4.$\frac{11}{6}$ 5.$\frac{6}{5}$ 6.$\frac{6}{5}$
