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 $60×(\frac{1}{5}+\frac{1}{10})=$
答案: $60×\frac{1}{5}+60×\frac{1}{10}=12+6=18$
② $8×\frac{1}{8}-\frac{7}{8}=$
答案: $1-\frac{7}{8}=\frac{1}{8}$
③ $\frac{1}{2}-\frac{1}{4}+\frac{1}{3}=$
答案: $\frac{6}{12}-\frac{3}{12}+\frac{4}{12}=\frac{7}{12}$
④ $\frac{1}{3}-\frac{1}{4}+\frac{3}{5}=$
答案: $\frac{20}{60}-\frac{15}{60}+\frac{36}{60}=\frac{41}{60}$
⑤ $\frac{2}{3}+\frac{1}{6}-\frac{5}{18}=$
答案: $\frac{12}{18}+\frac{3}{18}-\frac{5}{18}=\frac{10}{18}=\frac{5}{9}$
⑥ $\frac{1}{6}+\frac{5}{12}+\frac{5}{6}=$
答案: $(\frac{1}{6}+\frac{5}{6})+\frac{5}{12}=1+\frac{5}{12}=1\frac{5}{12}$
⑦ $\frac{1}{2}-(\frac{1}{2}-\frac{1}{5})=$
答案: $\frac{1}{2}-\frac{1}{2}+\frac{1}{5}=\frac{1}{5}$
⑧ $1-(\frac{1}{2}+\frac{1}{3})=$
答案: $1-\frac{5}{6}=\frac{1}{6}$
⑨ $\frac{5}{7}-\frac{1}{14}-\frac{3}{14}=$
答案: $\frac{5}{7}-(\frac{1}{14}+\frac{3}{14})=\frac{5}{7}-\frac{2}{7}=\frac{3}{7}$
⑩ $\frac{4}{5}-(\frac{7}{10}-\frac{11}{20})=$
答案: $\frac{16}{20}-(\frac{14}{20}-\frac{11}{20})=\frac{16}{20}-\frac{3}{20}=\frac{13}{20}$
⑪ $\frac{5}{6}-(\frac{3}{8}+\frac{1}{3})=$
答案: $\frac{20}{24}-(\frac{9}{24}+\frac{8}{24})=\frac{20}{24}-\frac{17}{24}=\frac{1}{8}$
⑫ $\frac{1}{2}-\frac{2}{5}+\frac{3}{10}=$
答案: $\frac{5}{10}-\frac{4}{10}+\frac{3}{10}=\frac{4}{10}=\frac{2}{5}$
⑬ $\frac{1}{4}+\frac{5}{8}-\frac{1}{2}=$
答案: $\frac{2}{8}+\frac{5}{8}-\frac{4}{8}=\frac{3}{8}$
⑭ $6×(\frac{1}{2}+\frac{1}{3})=$
答案: $6×\frac{1}{2}+6×\frac{1}{3}=3+2=5$
⑮ $30×(\frac{1}{3}+\frac{1}{5})=$
答案: $30×\frac{1}{3}+30×\frac{1}{5}=10+6=16$
⑯ $1-\frac{1}{3}-\frac{2}{3}=$
答案: $1-(\frac{1}{3}+\frac{2}{3})=1-1=0$
⑰ $32×\frac{1}{4}+32×\frac{1}{8}=$
答案: $8+4=12$
⑱ $(\frac{1}{3}-\frac{1}{9})×54=$
答案: $54×\frac{1}{3}-54×\frac{1}{9}=18-6=12$
⑲ $(\frac{1}{4}×\frac{1}{6})×12=$
答案: $\frac{1}{4}×12×\frac{1}{6}=3×\frac{1}{6}=\frac{1}{2}$
⑳ $24×(\frac{1}{2}-\frac{1}{3})=$
答案: $24×\frac{1}{2}-24×\frac{1}{3}=12-8=4$
㉑ $1-\frac{5}{8}+\frac{3}{8}=$
答案: $1-(\frac{5}{8}-\frac{3}{8})=1-\frac{1}{4}=\frac{3}{4}$
㉒ $\frac{4}{5}-\frac{16}{25}×\frac{1}{8}=$
答案: $\frac{4}{5}-\frac{2}{25}=\frac{20}{25}-\frac{2}{25}=\frac{18}{25}$

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