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1. 直接写出得数。(20☆)
$\frac{3}{4}×8=$
$\frac{5}{7}×\frac{14}{15}=$
$\frac{2}{9}×\frac{3}{4}=$
$1.2×\frac{5}{6}=$
$\frac{7}{10}×\frac{5}{14}=$
$\frac{4}{5}×\frac{3}{8}=$
$\frac{9}{11}×\frac{22}{27}=$
$\frac{5}{12}×4=$
$\frac{8}{15}×\frac{5}{6}=$
$\frac{11}{13}×0.26=$
$\frac{3}{5}×\frac{10}{9}=$
$1.5×\frac{7}{5}=$
$\frac{8}{7}×\frac{7}{4}=$
$\frac{13}{18}×\frac{9}{26}=$
$\frac{5}{6}×\frac{3}{10}=$
$\frac{7}{12}×\frac{3}{14}=$
$\frac{16}{21}×\frac{7}{8}=$
$\frac{4}{9}×\frac{3}{2}=$
$\frac{15}{16}×\frac{4}{5}=$
$\frac{2}{7}×\frac{21}{8}=$
$\frac{3}{4}×8=$
$\frac{5}{7}×\frac{14}{15}=$
$\frac{2}{9}×\frac{3}{4}=$
$1.2×\frac{5}{6}=$
$\frac{7}{10}×\frac{5}{14}=$
$\frac{4}{5}×\frac{3}{8}=$
$\frac{9}{11}×\frac{22}{27}=$
$\frac{5}{12}×4=$
$\frac{8}{15}×\frac{5}{6}=$
$\frac{11}{13}×0.26=$
$\frac{3}{5}×\frac{10}{9}=$
$1.5×\frac{7}{5}=$
$\frac{8}{7}×\frac{7}{4}=$
$\frac{13}{18}×\frac{9}{26}=$
$\frac{5}{6}×\frac{3}{10}=$
$\frac{7}{12}×\frac{3}{14}=$
$\frac{16}{21}×\frac{7}{8}=$
$\frac{4}{9}×\frac{3}{2}=$
$\frac{15}{16}×\frac{4}{5}=$
$\frac{2}{7}×\frac{21}{8}=$
答案
1. $\frac{3}{4}×8=6$
$\frac{5}{7}×\frac{14}{15}=\frac{2}{3}$
$\frac{2}{9}×\frac{3}{4}=\frac{1}{6}$
$1.2×\frac{5}{6}=1$
$\frac{7}{10}×\frac{5}{14}=\frac{1}{4}$
$\frac{4}{5}×\frac{3}{8}=\frac{3}{10}$
$\frac{9}{11}×\frac{22}{27}=\frac{2}{3}$
$\frac{5}{12}×4=\frac{5}{3}$
$\frac{8}{15}×\frac{5}{6}=\frac{4}{9}$
$\frac{11}{13}×0.26=\frac{11}{50}$
$\frac{3}{5}×\frac{10}{9}=\frac{2}{3}$
$1.5×\frac{7}{5}=\frac{21}{10}$
$\frac{8}{7}×\frac{7}{4}=2$
$\frac{13}{18}×\frac{9}{26}=\frac{1}{4}$
$\frac{5}{6}×\frac{3}{10}=\frac{1}{4}$
$\frac{7}{12}×\frac{3}{14}=\frac{1}{8}$
$\frac{16}{21}×\frac{7}{8}=\frac{2}{3}$
$\frac{4}{9}×\frac{3}{2}=\frac{2}{3}$
$\frac{15}{16}×\frac{4}{5}=\frac{3}{4}$
$\frac{2}{7}×\frac{21}{8}=\frac{3}{4}$
$\frac{5}{7}×\frac{14}{15}=\frac{2}{3}$
$\frac{2}{9}×\frac{3}{4}=\frac{1}{6}$
$1.2×\frac{5}{6}=1$
$\frac{7}{10}×\frac{5}{14}=\frac{1}{4}$
$\frac{4}{5}×\frac{3}{8}=\frac{3}{10}$
$\frac{9}{11}×\frac{22}{27}=\frac{2}{3}$
$\frac{5}{12}×4=\frac{5}{3}$
$\frac{8}{15}×\frac{5}{6}=\frac{4}{9}$
$\frac{11}{13}×0.26=\frac{11}{50}$
$\frac{3}{5}×\frac{10}{9}=\frac{2}{3}$
$1.5×\frac{7}{5}=\frac{21}{10}$
$\frac{8}{7}×\frac{7}{4}=2$
$\frac{13}{18}×\frac{9}{26}=\frac{1}{4}$
$\frac{5}{6}×\frac{3}{10}=\frac{1}{4}$
$\frac{7}{12}×\frac{3}{14}=\frac{1}{8}$
$\frac{16}{21}×\frac{7}{8}=\frac{2}{3}$
$\frac{4}{9}×\frac{3}{2}=\frac{2}{3}$
$\frac{15}{16}×\frac{4}{5}=\frac{3}{4}$
$\frac{2}{7}×\frac{21}{8}=\frac{3}{4}$
2. 运用乘法运算律填一填,算一算。(12☆)
(1) $\frac{5}{7}×\frac{10}{11}×\frac{7}{5}=\frac{5}{7}×□◯□=(\quad)$
(2) $\frac{5}{9}×5×\frac{7}{5}=□◯(□◯□)=(\quad)$
(3) $(\frac{5}{6}-\frac{2}{7})×42=□◯□-□◯□=(\quad)$
(4) $\frac{13}{10}×99+\frac{13}{10}=□◯(□◯□)=(\quad)$
(1) $\frac{5}{7}×\frac{10}{11}×\frac{7}{5}=\frac{5}{7}×□◯□=(\quad)$
(2) $\frac{5}{9}×5×\frac{7}{5}=□◯(□◯□)=(\quad)$
(3) $(\frac{5}{6}-\frac{2}{7})×42=□◯□-□◯□=(\quad)$
(4) $\frac{13}{10}×99+\frac{13}{10}=□◯(□◯□)=(\quad)$
答案
(1) $\frac{5}{7}×\frac{10}{11}×\frac{7}{5}=\frac{5}{7}×\frac{7}{5}×\frac{10}{11}=\frac{10}{11}$
(2) $\frac{5}{9}×5×\frac{7}{5}=\frac{5}{9}×(5×\frac{7}{5})=\frac{35}{9}$
(3) $(\frac{5}{6}-\frac{2}{7})×42=\frac{5}{6}×42-\frac{2}{7}×42=23$
(4) $\frac{13}{10}×99+\frac{13}{10}=\frac{13}{10}×(99+1)=130$
(2) $\frac{5}{9}×5×\frac{7}{5}=\frac{5}{9}×(5×\frac{7}{5})=\frac{35}{9}$
(3) $(\frac{5}{6}-\frac{2}{7})×42=\frac{5}{6}×42-\frac{2}{7}×42=23$
(4) $\frac{13}{10}×99+\frac{13}{10}=\frac{13}{10}×(99+1)=130$
3. 计算下面各题,能简算的要简算。(18☆)
$(\frac{5}{8}+\frac{3}{7})×5.6$
$\frac{5}{9}×\frac{7}{11}+\frac{5}{9}×\frac{4}{11}$
$\frac{3}{10}×101-\frac{3}{10}$
$(\frac{3}{4}+\frac{7}{12})×(1-\frac{1}{10})$
$\frac{6}{11}×\frac{7}{8}+\frac{6}{11}×\frac{1}{8}$
$\frac{13}{24}×17+\frac{17}{24}×6+\frac{5}{24}×17$
$(\frac{5}{8}+\frac{3}{7})×5.6$
$\frac{5}{9}×\frac{7}{11}+\frac{5}{9}×\frac{4}{11}$
$\frac{3}{10}×101-\frac{3}{10}$
$(\frac{3}{4}+\frac{7}{12})×(1-\frac{1}{10})$
$\frac{6}{11}×\frac{7}{8}+\frac{6}{11}×\frac{1}{8}$
$\frac{13}{24}×17+\frac{17}{24}×6+\frac{5}{24}×17$
答案
$(\frac{5}{8}+\frac{3}{7})×5.6=\frac{59}{10}$
$\frac{5}{9}×\frac{7}{11}+\frac{5}{9}×\frac{4}{11}=\frac{5}{9}$
$\frac{3}{10}×101-\frac{3}{10}=30$
$(\frac{3}{4}+\frac{7}{12})×(1-\frac{1}{10})=\frac{6}{5}$
$\frac{6}{11}×\frac{7}{8}+\frac{6}{11}×\frac{1}{8}=\frac{6}{11}$
$\frac{13}{24}×17+\frac{17}{24}×6+\frac{5}{24}×17=17$
$\frac{5}{9}×\frac{7}{11}+\frac{5}{9}×\frac{4}{11}=\frac{5}{9}$
$\frac{3}{10}×101-\frac{3}{10}=30$
$(\frac{3}{4}+\frac{7}{12})×(1-\frac{1}{10})=\frac{6}{5}$
$\frac{6}{11}×\frac{7}{8}+\frac{6}{11}×\frac{1}{8}=\frac{6}{11}$
$\frac{13}{24}×17+\frac{17}{24}×6+\frac{5}{24}×17=17$
