《2025年阳光同学计算小达人五年级数学下册冀教版》

1. 直接写出得数。（建议2分钟完成）
$20\times\frac{9}{10}=$ $\frac{7}{24}\times12=$ $\frac{2}{5}\times\frac{2}{7}\times\frac{5}{4}=$
$39\times\frac{12}{13}=$ $\frac{1}{6}\times72=$ $\frac{7}{8}\times\frac{5}{9}\times\frac{18}{5}=$
$\frac{4}{5}\times2=$ $60\times\frac{3}{5}=$ $6\times\frac{3}{7}\times\frac{7}{6}=$
$\frac{11}{57}\times19=$ $0\times\frac{27}{56}=$ $\frac{5}{12}\times\frac{1}{2}\times\frac{12}{5}=$

答案： 18@@$\frac{7}{2}$@@$\frac{1}{7}$@@36@@12@@$\frac{7}{4}$@@$\frac{8}{5}$@@36@@3@@$\frac{11}{3}$@@0@@$\frac{1}{2}$

2. 计算下面各题。（建议6分钟完成）
$\frac{17}{18}\times\frac{9}{34}+\frac{1}{2}$ $\frac{12}{13}\times\frac{3}{2}-\frac{2}{3}$ $\frac{4}{11}\times(\frac{5}{6}-\frac{4}{5})$
$\frac{9}{5}\times(\frac{5}{9}-\frac{1}{18})$ $\frac{1}{4}+\frac{11}{12}\times\frac{3}{22}$ $(\frac{3}{8}+\frac{1}{6})\times\frac{6}{5}$
$\frac{3}{4}\times\frac{8}{9}-\frac{2}{5}$ $\frac{5}{12}\times(\frac{4}{5}+\frac{2}{3})$ $26\times(\frac{9}{13}-\frac{1}{2})$

答案： $\frac{3}{4}$@@$\frac{28}{39}$@@$\frac{2}{165}$@@$\frac{9}{10}$@@$\frac{3}{8}$@@$\frac{13}{20}$@@$\frac{4}{15}$@@$\frac{11}{18}$@@5

用简便方法计算。
$\frac{40}{43}\times\frac{8}{19}-\frac{16}{43}\times\frac{1}{19}$ $42\times\frac{25}{99}+25\times\frac{46}{99}$ $\frac{18}{17}\times5-\frac{10}{17}-\frac{5}{17}$

答案： @@$\frac{16}{43}$@@$22\frac{2}{9}$@@$4\frac{7}{17}$