《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）
$\frac{1}{4}\times\frac{2}{5}=$ $\frac{1}{7}\times\frac{1}{5}=$ $\frac{3}{14}\times\frac{1}{2}=$ $\frac{4}{15}\times\frac{5}{8}=$
$\frac{1}{6}\times\frac{5}{6}=$ $\frac{1}{20}\times\frac{5}{13}=$ $\frac{7}{8}\times\frac{3}{5}=$ $\frac{5}{8}\times\frac{16}{15}=$
$\frac{5}{9}\times\frac{3}{8}=$ $\frac{4}{11}\times\frac{5}{8}=$ $\frac{11}{12}\times\frac{3}{22}=$ $\frac{3}{13}\times\frac{3}{5}=$
$\frac{4}{5}\times\frac{5}{16}=$ $\frac{17}{18}\times\frac{9}{34}=$ $\frac{3}{4}\times\frac{6}{5}=$ $\frac{9}{16}\times\frac{8}{3}=$

答案： $\frac{1}{10}$@@$\frac{1}{35}$@@$\frac{3}{28}$@@$\frac{1}{6}$@@$\frac{5}{36}$@@$\frac{1}{52}$@@$\frac{21}{40}$@@$\frac{2}{3}$@@$\frac{5}{24}$@@$\frac{5}{22}$@@$\frac{1}{8}$@@$\frac{9}{65}$@@$\frac{1}{4}$@@$\frac{1}{4}$@@$\frac{9}{10}$@@$\frac{3}{2}$

2. 计算下面各题，能简算的要简算。（建议 6 分钟完成）
$\frac{2}{3}+\frac{2}{3}\times\frac{9}{16}$ $\frac{13}{7}-\frac{2}{7}\times\frac{7}{30}$ $\frac{9}{13}\times\frac{8}{15}+\frac{8}{13}\times\frac{4}{15}$
$\frac{4}{7}\times\frac{14}{25}\times\frac{5}{28}$ $48\times(\frac{5}{8}+\frac{5}{6})$ $(\frac{5}{9}-\frac{1}{18})\times(\frac{3}{4}+\frac{1}{6})$
$(\frac{5}{6}-\frac{1}{3})\times\frac{12}{7}$ $\frac{11}{9}\times\frac{4}{5}\times\frac{45}{22}$ $\frac{2}{19}\times\frac{8}{17}+\frac{8}{19}$

答案： $\frac{25}{24}$@@$\frac{188}{105}$@@$\frac{8}{15}$@@$\frac{2}{35}$@@70@@$\frac{11}{24}$@@$\frac{6}{7}$@@2@@$\frac{8}{17}$

用简便方法计算。
$\frac{6}{13}\times14 - 4\times\frac{7}{13}+6\times\frac{8}{13}$ $\frac{15}{17}\times6+\frac{29}{17}\times11+14\times\frac{6}{17}$

答案： @@8@@29