2025年文墨小学数学口算心算天天练五年级下册人教版


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《2025年文墨小学数学口算心算天天练五年级下册人教版》

① $24 × \frac{1}{2} ◯ \frac{3}{4} × \frac{2}{3}$
答案: 左边:$24 × \frac{1}{2} = 12$,右边:$\frac{3}{4} × \frac{2}{3} = \frac{1}{2}$,$12 > \frac{1}{2}$,故填>。
② $15 × \frac{1}{20} ◯ 22 × \frac{1}{33}$
答案: 左边:$15 × \frac{1}{20} = \frac{3}{4}$,右边:$22 × \frac{1}{33} = \frac{2}{3}$,$\frac{3}{4} = 0.75$,$\frac{2}{3} \approx 0.666$,$0.75 > 0.666$,故填>。
③ $\frac{1}{4} × 3 ◯ \frac{2}{5} × \frac{1}{2}$
答案: 左边:$\frac{1}{4} × 3 = \frac{3}{4}$,右边:$\frac{2}{5} × \frac{1}{2} = \frac{1}{5}$,$\frac{3}{4} = 0.75$,$\frac{1}{5} = 0.2$,$0.75 > 0.2$,故填>。
④ $\frac{4}{21} × \frac{7}{8} ◯ 13 × \frac{5}{39}$
答案: 左边:$\frac{4}{21} × \frac{7}{8} = \frac{28}{168} = \frac{1}{6}$,右边:$13 × \frac{5}{39} = \frac{5}{3}$,$\frac{1}{6} < \frac{5}{3}$,故填<。
⑤ $\frac{1}{4} × 16 ◯ \frac{3}{5} × 3$
答案: 左边:$\frac{1}{4} × 16 = 4$,右边:$\frac{3}{5} × 3 = \frac{9}{5} = 1.8$,$4 > 1.8$,故填>。
⑥ $\frac{5}{42} × \frac{7}{15} ◯ 3 × \frac{8}{9}$
答案: 左边:$\frac{5}{42} × \frac{7}{15} = \frac{35}{630} = \frac{1}{18}$,右边:$3 × \frac{8}{9} = \frac{8}{3}$,$\frac{1}{18} < \frac{8}{3}$,故填<。
⑦ $\frac{7}{18} × 6 ◯ \frac{12}{7} × \frac{1}{12}$
答案: 左边:$\frac{7}{18} × 6 = \frac{42}{18} = \frac{7}{3}$,右边:$\frac{12}{7} × \frac{1}{12} = \frac{1}{7}$,$\frac{7}{3} > \frac{1}{7}$,故填>。
⑧ $\frac{1}{5} × 2 ◯ \frac{4}{5} × \frac{1}{4}$
答案: 左边:$\frac{1}{5} × 2 = \frac{2}{5}$,右边:$\frac{4}{5} × \frac{1}{4} = \frac{1}{5}$,$\frac{2}{5} > \frac{1}{5}$,故填>。
⑨ $22 × \frac{3}{11} ◯ 21 × \frac{5}{7}$
答案: 左边:$22 × \frac{3}{11} = 6$,右边:$21 × \frac{5}{7} = 15$,$6 < 15$,故填<。
⑩ $\frac{3}{7} × \frac{1}{3} ◯ \frac{5}{7} × \frac{1}{6}$
答案: 左边:$\frac{3}{7} × \frac{1}{3} = \frac{1}{7}$,右边:$\frac{5}{7} × \frac{1}{6} = \frac{5}{42}$,$\frac{1}{7} = \frac{6}{42} > \frac{5}{42}$,故填>。
⑪ $\frac{1}{2} × \frac{1}{2} ◯ \frac{1}{4} × \frac{1}{4}$
答案: 左边:$\frac{1}{2} × \frac{1}{2} = \frac{1}{4}$,右边:$\frac{1}{4} × \frac{1}{4} = \frac{1}{16}$,$\frac{1}{4} > \frac{1}{16}$,故填>。
⑫ $\frac{1}{4} × \frac{1}{10} ◯ \frac{5}{6} × \frac{2}{5}$
答案: 左边:$\frac{1}{4} × \frac{1}{10} = \frac{1}{40}$,右边:$\frac{5}{6} × \frac{2}{5} = \frac{1}{3}$,$\frac{1}{40} < \frac{1}{3}$,故填<。
⑬ $5 × \frac{3}{10} ◯ 8 × \frac{1}{4}$
答案: 左边:$5 × \frac{3}{10} = \frac{3}{2}$,右边:$8 × \frac{1}{4} = 2$,$\frac{3}{2} = 1.5 < 2$,故填<。
⑭ $\frac{9}{5} × \frac{4}{7} ◯ \frac{4}{7} × \frac{7}{9}$
答案: 左边:$\frac{9}{5} × \frac{4}{7} = \frac{36}{35}$,右边:$\frac{4}{7} × \frac{7}{9} = \frac{4}{9}$,$\frac{36}{35} > 1 > \frac{4}{9}$,故填>。
⑮ $9 × \frac{5}{6} ◯ 30 × \frac{7}{15}$
答案: 左边:$9 × \frac{5}{6} = \frac{45}{6} = \frac{15}{2} = 7.5$,右边:$30 × \frac{7}{15} = 14$,$7.5 < 14$,故填<。
⑯ $6 × \frac{5}{7} ◯ \frac{1}{7} × \frac{4}{5}$
答案: 左边:$6 × \frac{5}{7} = \frac{30}{7}$,右边:$\frac{1}{7} × \frac{4}{5} = \frac{4}{35}$,$\frac{30}{7} = \frac{150}{35} > \frac{4}{35}$,故填>。
⑰ $\frac{3}{4} × \frac{2}{5} ◯ \frac{2}{5} × \frac{5}{4}$
答案: 左边:$\frac{3}{4} × \frac{2}{5} = \frac{6}{20} = \frac{3}{10}$,右边:$\frac{2}{5} × \frac{5}{4} = \frac{10}{20} = \frac{1}{2}$,$\frac{3}{10} = 0.3 < 0.5$,故填<。
⑱ $\frac{3}{5} × \frac{4}{7} ◯ \frac{1}{7} × \frac{4}{5}$
答案: 左边:$\frac{3}{5} × \frac{4}{7} = \frac{12}{35}$,右边:$\frac{1}{7} × \frac{4}{5} = \frac{4}{35}$,$\frac{12}{35} > \frac{4}{35}$,故填>。
⑲ $\frac{3}{4} × \frac{1}{6} ◯ \frac{3}{7} × 28$
答案: 左边:$\frac{3}{4} × \frac{1}{6} = \frac{3}{24} = \frac{1}{8}$,右边:$\frac{3}{7} × 28 = 12$,$\frac{1}{8} < 12$,故填<。
⑳ $\frac{5}{8} × \frac{3}{7} ◯ \frac{5}{7} × \frac{2}{5}$
答案: 左边:$\frac{5}{8} × \frac{3}{7} = \frac{15}{56}$,右边:$\frac{5}{7} × \frac{2}{5} = \frac{2}{7} = \frac{16}{56}$,$\frac{15}{56} < \frac{16}{56}$,故填<。

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