《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）
$\frac{2}{7} \div \frac{8}{21} =$ $\frac{7}{15} \div \frac{1}{5} =$ $\frac{3}{4} \div \frac{5}{12} =$ $\frac{1}{2} \div \frac{1}{6} =$
$\frac{7}{13} \div \frac{7}{26} =$ $\frac{1}{5} \div \frac{1}{25} =$ $\frac{9}{10} \div \frac{3}{25} =$ $\frac{5}{12} \div \frac{2}{5} =$
$\frac{1}{3} \div \frac{8}{9} =$ $\frac{8}{19} \div 4 =$ $\frac{7}{8} \div \frac{4}{5} =$ $\frac{6}{7} \div \frac{18}{7} =$
$4 \div \frac{8}{15} =$ $\frac{5}{6} \div \frac{5}{18} =$ $\frac{1}{4} \div \frac{1}{20} =$ $\frac{3}{20} \div \frac{1}{40} =$

答案： $\frac{3}{4}$@@$\frac{7}{3}$@@$\frac{9}{5}$@@3@@2@@5@@$\frac{15}{2}$@@$\frac{25}{24}$@@$\frac{3}{8}$@@$\frac{2}{19}$@@$\frac{35}{32}$@@$\frac{1}{3}$@@$\frac{15}{2}$@@3@@5@@6

2. 解方程。（建议6分钟完成）
$6x = \frac{3}{14}$ $(1 - \frac{2}{5})x = 1200$ $x + \frac{6}{11}x = 510$
$x - \frac{4}{9}x = 7500$ $\frac{9}{10}x = \frac{3}{5}$ $(1 + \frac{3}{16})x = 570$
$\frac{3}{4}x = 6$ $(1 + \frac{3}{7})x = 200$ $x - \frac{5}{11}x = 240$

答案： $x = \frac{1}{28}$@@$x = 2000$@@$x = 330$@@$x = 13500$@@$x = \frac{2}{3}$@@$x = 480$@@$x = 8$@@$x = 140$@@$x = 440$

照样子用简便方法计算。
$(\frac{12}{13} + \frac{15}{16}) \div (\frac{4}{13} + \frac{5}{16})$ $(\frac{25}{18} - \frac{10}{9}) \div (\frac{5}{18} - \frac{2}{9})$
$= 3 \times (\frac{4}{13} + \frac{5}{16}) \div (\frac{4}{13} + \frac{5}{16})$
$= 3$

答案： 提升练 5