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一、在$◯$里填“＞”“＜”或“=”。
$\frac {7}{15}×\frac {6}{7}$
$\frac {8}{9}×\frac {5}{6}$
$\frac {7}{8}×\frac {11}{9}$
$12×\frac {8}{7}$
$\frac {9}{5}×\frac {8}{9}$
$\frac {11}{12}×\frac {8}{9}$
$\frac {1}{5}×9$
$\frac {1}{4}×\frac {6}{11}$
$2×\frac {5}{7}$
$\frac {8}{9}×\frac {11}{9}$
$5×\frac {2}{3}$
$\frac {6}{7}×\frac {3}{5}$
$\frac {7}{15}×\frac {6}{7}$
＜
$\frac {7}{15}$$\frac {8}{9}×\frac {5}{6}$
＜
$\frac {8}{9}$$\frac {7}{8}×\frac {11}{9}$
＞
$\frac {7}{8}$$12×\frac {8}{7}$
＞
$12$$\frac {9}{5}×\frac {8}{9}$
＞
$\frac {8}{9}$$\frac {11}{12}×\frac {8}{9}$
＜
$\frac {11}{12}$$\frac {1}{5}×9$
＞
$\frac {1}{5}×8$$\frac {1}{4}×\frac {6}{11}$
＜
$\frac {6}{11}×\frac {7}{8}$$2×\frac {5}{7}$
=
$\frac {5}{7}×2$$\frac {8}{9}×\frac {11}{9}$
＞
$\frac {8}{9}×1$$5×\frac {2}{3}$
=
$\frac {2}{3}×5$$\frac {6}{7}×\frac {3}{5}$
＞
$\frac {5}{7}×\frac {3}{5}$答案
＜ ＜ ＞ ＞ ＞ ＜ ＞ ＜ = ＞ = ＞
解析
$\frac {7}{15}×\frac {6}{7}＜\frac {7}{15}$
$\frac {8}{9}×\frac {5}{6}＜\frac {8}{9}$
$\frac {7}{8}×\frac {11}{9}＞\frac {7}{8}$
$12×\frac {8}{7}＞12$
$\frac {9}{5}×\frac {8}{9}＞\frac {8}{9}$
$\frac {11}{12}×\frac {8}{9}＜\frac {11}{12}$
$\frac {1}{5}×9＞\frac {1}{5}×8$
$\frac {1}{4}×\frac {6}{11}＜\frac {6}{11}×\frac {7}{8}$
$2×\frac {5}{7}=\frac {5}{7}×2$
$\frac {8}{9}×\frac {11}{9}＞\frac {8}{9}×1$
$5×\frac {2}{3}=\frac {2}{3}×5$
$\frac {6}{7}×\frac {3}{5}＞\frac {5}{7}×\frac {3}{5}$
$\frac {8}{9}×\frac {5}{6}＜\frac {8}{9}$
$\frac {7}{8}×\frac {11}{9}＞\frac {7}{8}$
$12×\frac {8}{7}＞12$
$\frac {9}{5}×\frac {8}{9}＞\frac {8}{9}$
$\frac {11}{12}×\frac {8}{9}＜\frac {11}{12}$
$\frac {1}{5}×9＞\frac {1}{5}×8$
$\frac {1}{4}×\frac {6}{11}＜\frac {6}{11}×\frac {7}{8}$
$2×\frac {5}{7}=\frac {5}{7}×2$
$\frac {8}{9}×\frac {11}{9}＞\frac {8}{9}×1$
$5×\frac {2}{3}=\frac {2}{3}×5$
$\frac {6}{7}×\frac {3}{5}＞\frac {5}{7}×\frac {3}{5}$
二、在$□$里填合适的数。
$\frac{24}{5}$
$\frac{6}{5}$
1
$3\frac{2}{9}$
9
$\frac{5}{2}$
1
$\frac{1}{18}$
答案
$\frac{24}{5}$ $\frac{6}{5}$ 1 $3\frac{2}{9}$ 9 $\frac{5}{2}$ 1 $\frac{1}{18}$
三、计算下面各题。
$\frac {11}{7}×\frac {2}{3}×\frac {21}{22}$
$\frac {1}{18}×\frac {8}{5}×\frac {9}{4}$
$6×\frac {7}{18}×\frac {3}{7}$
$\frac {4}{7}×2.1×\frac {2}{5}$
$\frac {20}{3}×\frac {9}{2}×15$
$\frac {9}{10}×\frac {4}{3}×\frac {5}{12}$
$\frac {5}{2}×6×\frac {4}{5}$
$\frac {3}{8}×\frac {5}{6}×\frac {8}{15}$
$\frac {13}{24}×\frac {3}{2}×\frac {2}{13}$
$\frac {3}{8}×\frac {16}{21}×\frac {7}{9}$
$\frac {7}{6}×\frac {13}{14}×\frac {9}{26}$
$\frac {4}{5}×15×\frac {9}{16}$
$\frac {7}{15}×5×\frac {4}{21}$
$\frac {5}{7}×\frac {14}{15}×\frac {3}{5}$
$\frac {8}{15}×12×\frac {7}{16}$
$\frac {5}{6}×\frac {5}{8}×\frac {24}{25}$
$\frac {16}{39}×\frac {26}{27}×\frac {9}{10}$
$\frac {5}{6}×\frac {8}{13}×\frac {13}{20}$
$\frac {3}{7}×\frac {2}{5}×\frac {35}{42}$
$91×\frac {7}{13}×\frac {5}{49}$
$\frac {2}{9}×\frac {3}{20}×\frac {9}{11}$
$\frac {11}{7}×\frac {2}{3}×\frac {21}{22}$
$\frac {1}{18}×\frac {8}{5}×\frac {9}{4}$
$6×\frac {7}{18}×\frac {3}{7}$
$\frac {4}{7}×2.1×\frac {2}{5}$
$\frac {20}{3}×\frac {9}{2}×15$
$\frac {9}{10}×\frac {4}{3}×\frac {5}{12}$
$\frac {5}{2}×6×\frac {4}{5}$
$\frac {3}{8}×\frac {5}{6}×\frac {8}{15}$
$\frac {13}{24}×\frac {3}{2}×\frac {2}{13}$
$\frac {3}{8}×\frac {16}{21}×\frac {7}{9}$
$\frac {7}{6}×\frac {13}{14}×\frac {9}{26}$
$\frac {4}{5}×15×\frac {9}{16}$
$\frac {7}{15}×5×\frac {4}{21}$
$\frac {5}{7}×\frac {14}{15}×\frac {3}{5}$
$\frac {8}{15}×12×\frac {7}{16}$
$\frac {5}{6}×\frac {5}{8}×\frac {24}{25}$
$\frac {16}{39}×\frac {26}{27}×\frac {9}{10}$
$\frac {5}{6}×\frac {8}{13}×\frac {13}{20}$
$\frac {3}{7}×\frac {2}{5}×\frac {35}{42}$
$91×\frac {7}{13}×\frac {5}{49}$
$\frac {2}{9}×\frac {3}{20}×\frac {9}{11}$
答案
1 $\frac{1}{5}$ 1 $\frac{12}{25}$ 450 $\frac{1}{2}$ 12 $\frac{1}{6}$ $\frac{1}{8}$ $\frac{2}{9}$ $\frac{3}{8}$ $\frac{27}{4}$ $\frac{4}{9}$ $\frac{2}{5}$ $\frac{14}{5}$ $\frac{1}{2}$ $\frac{16}{45}$ $\frac{1}{3}$ $\frac{1}{7}$ 5 $\frac{3}{110}$
解析
1. $\frac{11}{7}×\frac{2}{3}×\frac{21}{22}$
$=\frac{11}{7}×\frac{21}{22}×\frac{2}{3}$
$=\frac{3}{2}×\frac{2}{3}$
$=1$
2. $\frac{1}{18}×\frac{8}{5}×\frac{9}{4}$
$=\frac{1}{18}×\frac{9}{4}×\frac{8}{5}$
$=\frac{1}{8}×\frac{8}{5}$
$=\frac{1}{5}$
3. $6×\frac{7}{18}×\frac{3}{7}$
$=6×(\frac{7}{18}×\frac{3}{7})$
$=6×\frac{1}{6}$
$=1$
4. $\frac{4}{7}×2.1×\frac{2}{5}$
$=\frac{4}{7}×\frac{21}{10}×\frac{2}{5}$
$=\frac{6}{5}×\frac{2}{5}$
$=\frac{12}{25}$
5. $\frac{20}{3}×\frac{9}{2}×15$
$=30×15$
$=450$
6. $\frac{9}{10}×\frac{4}{3}×\frac{5}{12}$
$=\frac{6}{5}×\frac{5}{12}$
$=\frac{1}{2}$
7. $\frac{5}{2}×6×\frac{4}{5}$
$=\frac{5}{2}×\frac{4}{5}×6$
$=2×6$
$=12$
8. $\frac{3}{8}×\frac{5}{6}×\frac{8}{15}$
$=\frac{3}{8}×\frac{8}{15}×\frac{5}{6}$
$=\frac{1}{5}×\frac{5}{6}$
$=\frac{1}{6}$
9. $\frac{13}{24}×\frac{3}{2}×\frac{2}{13}$
$=\frac{13}{24}×\frac{2}{13}×\frac{3}{2}$
$=\frac{1}{12}×\frac{3}{2}$
$=\frac{1}{8}$
10. $\frac{3}{8}×\frac{16}{21}×\frac{7}{9}$
$=\frac{2}{7}×\frac{7}{9}$
$=\frac{2}{9}$
11. $\frac{7}{6}×\frac{13}{14}×\frac{9}{26}$
$=\frac{13}{12}×\frac{9}{26}$
$=\frac{3}{8}$
12. $\frac{4}{5}×15×\frac{9}{16}$
$=12×\frac{9}{16}$
$=\frac{27}{4}$
13. $\frac{7}{15}×5×\frac{4}{21}$
$=\frac{7}{3}×\frac{4}{21}$
$=\frac{4}{9}$
14. $\frac{5}{7}×\frac{14}{15}×\frac{3}{5}$
$=\frac{2}{3}×\frac{3}{5}$
$=\frac{2}{5}$
15. $\frac{8}{15}×12×\frac{7}{16}$
$=\frac{32}{5}×\frac{7}{16}$
$=\frac{14}{5}$
16. $\frac{5}{6}×\frac{5}{8}×\frac{24}{25}$
$=\frac{5}{6}×(\frac{5}{8}×\frac{24}{25})$
$=\frac{5}{6}×\frac{3}{5}$
$=\frac{1}{2}$
17. $\frac{16}{39}×\frac{26}{27}×\frac{9}{10}$
$=\frac{32}{81}×\frac{9}{10}$
$=\frac{16}{45}$
18. $\frac{5}{6}×\frac{8}{13}×\frac{13}{20}$
$=\frac{5}{6}×(\frac{8}{13}×\frac{13}{20})$
$=\frac{5}{6}×\frac{2}{5}$
$=\frac{1}{3}$
19. $\frac{3}{7}×\frac{2}{5}×\frac{35}{42}$
$=\frac{3}{7}×\frac{35}{42}×\frac{2}{5}$
$=\frac{5}{14}×\frac{2}{5}$
$=\frac{1}{7}$
20. $91×\frac{7}{13}×\frac{5}{49}$
$=49×\frac{5}{49}$
$=5$
21. $\frac{2}{9}×\frac{3}{20}×\frac{9}{11}$
$=\frac{2}{9}×\frac{9}{11}×\frac{3}{20}$
$=\frac{2}{11}×\frac{3}{20}$
$=\frac{3}{110}$
$=\frac{11}{7}×\frac{21}{22}×\frac{2}{3}$
$=\frac{3}{2}×\frac{2}{3}$
$=1$
2. $\frac{1}{18}×\frac{8}{5}×\frac{9}{4}$
$=\frac{1}{18}×\frac{9}{4}×\frac{8}{5}$
$=\frac{1}{8}×\frac{8}{5}$
$=\frac{1}{5}$
3. $6×\frac{7}{18}×\frac{3}{7}$
$=6×(\frac{7}{18}×\frac{3}{7})$
$=6×\frac{1}{6}$
$=1$
4. $\frac{4}{7}×2.1×\frac{2}{5}$
$=\frac{4}{7}×\frac{21}{10}×\frac{2}{5}$
$=\frac{6}{5}×\frac{2}{5}$
$=\frac{12}{25}$
5. $\frac{20}{3}×\frac{9}{2}×15$
$=30×15$
$=450$
6. $\frac{9}{10}×\frac{4}{3}×\frac{5}{12}$
$=\frac{6}{5}×\frac{5}{12}$
$=\frac{1}{2}$
7. $\frac{5}{2}×6×\frac{4}{5}$
$=\frac{5}{2}×\frac{4}{5}×6$
$=2×6$
$=12$
8. $\frac{3}{8}×\frac{5}{6}×\frac{8}{15}$
$=\frac{3}{8}×\frac{8}{15}×\frac{5}{6}$
$=\frac{1}{5}×\frac{5}{6}$
$=\frac{1}{6}$
9. $\frac{13}{24}×\frac{3}{2}×\frac{2}{13}$
$=\frac{13}{24}×\frac{2}{13}×\frac{3}{2}$
$=\frac{1}{12}×\frac{3}{2}$
$=\frac{1}{8}$
10. $\frac{3}{8}×\frac{16}{21}×\frac{7}{9}$
$=\frac{2}{7}×\frac{7}{9}$
$=\frac{2}{9}$
11. $\frac{7}{6}×\frac{13}{14}×\frac{9}{26}$
$=\frac{13}{12}×\frac{9}{26}$
$=\frac{3}{8}$
12. $\frac{4}{5}×15×\frac{9}{16}$
$=12×\frac{9}{16}$
$=\frac{27}{4}$
13. $\frac{7}{15}×5×\frac{4}{21}$
$=\frac{7}{3}×\frac{4}{21}$
$=\frac{4}{9}$
14. $\frac{5}{7}×\frac{14}{15}×\frac{3}{5}$
$=\frac{2}{3}×\frac{3}{5}$
$=\frac{2}{5}$
15. $\frac{8}{15}×12×\frac{7}{16}$
$=\frac{32}{5}×\frac{7}{16}$
$=\frac{14}{5}$
16. $\frac{5}{6}×\frac{5}{8}×\frac{24}{25}$
$=\frac{5}{6}×(\frac{5}{8}×\frac{24}{25})$
$=\frac{5}{6}×\frac{3}{5}$
$=\frac{1}{2}$
17. $\frac{16}{39}×\frac{26}{27}×\frac{9}{10}$
$=\frac{32}{81}×\frac{9}{10}$
$=\frac{16}{45}$
18. $\frac{5}{6}×\frac{8}{13}×\frac{13}{20}$
$=\frac{5}{6}×(\frac{8}{13}×\frac{13}{20})$
$=\frac{5}{6}×\frac{2}{5}$
$=\frac{1}{3}$
19. $\frac{3}{7}×\frac{2}{5}×\frac{35}{42}$
$=\frac{3}{7}×\frac{35}{42}×\frac{2}{5}$
$=\frac{5}{14}×\frac{2}{5}$
$=\frac{1}{7}$
20. $91×\frac{7}{13}×\frac{5}{49}$
$=49×\frac{5}{49}$
$=5$
21. $\frac{2}{9}×\frac{3}{20}×\frac{9}{11}$
$=\frac{2}{9}×\frac{9}{11}×\frac{3}{20}$
$=\frac{2}{11}×\frac{3}{20}$
$=\frac{3}{110}$
