《2025年阳光同学计算小达人五年级数学下册北师大版》

1.直接写出得数。（建议 3 分钟完成）
$\frac{1}{2} \times \frac{1}{5} =$ $\frac{5}{8} \times \frac{7}{9} =$ $\frac{14}{15} \times \frac{30}{7} =$ $\frac{1}{2} \times \frac{4}{5} =$
$\frac{22}{9} \times \frac{6}{11} =$ $\frac{13}{16} \times \frac{80}{39} =$ $\frac{4}{9} \times \frac{1}{8} =$ $\frac{5}{8} \times \frac{5}{4} =$
$\frac{2}{19} \times \frac{57}{58} =$ $\frac{5}{12} \times \frac{4}{5} =$ $\frac{9}{10} \times \frac{4}{45} =$ $\frac{9}{5} \times \frac{1}{3} =$
$\frac{9}{10} \times \frac{30}{7} =$ $\frac{4}{13} \times \frac{5}{4} =$ $\frac{2}{3} \times \frac{4}{5} =$ $\frac{2}{3} \times \frac{1}{4} =$
$\frac{15}{34} \times \frac{17}{45} =$ $\frac{3}{4} \times \frac{3}{4} =$ $\frac{2}{5} \times \frac{3}{4} =$ $\frac{16}{19} \times \frac{19}{8} =$

答案： $\frac{1}{10}$@@$\frac{35}{72}$@@4@@$\frac{2}{5}$@@$\frac{4}{3}$@@$\frac{5}{3}$@@$\frac{1}{18}$@@$\frac{25}{32}$@@$\frac{3}{29}$@@$\frac{1}{3}$@@$\frac{2}{25}$@@$\frac{3}{5}$@@$\frac{27}{7}$@@$\frac{5}{13}$@@$\frac{8}{15}$@@$\frac{1}{6}$@@$\frac{1}{6}$@@$\frac{9}{16}$@@$\frac{3}{10}$@@2

2.解方程。（建议 6 分钟完成）
$\frac{3}{5} + x = \frac{14}{15}$ $x - \frac{3}{4} = \frac{5}{8}$ $x - \frac{7}{10} = \frac{1}{2}$
$x - \frac{8}{13} = \frac{5}{26}$ $\frac{2}{7} + x = \frac{13}{14}$ $x + \frac{5}{8} = \frac{11}{12}$

答案： $x = \frac{1}{3}$@@$x = \frac{11}{8}$@@$x = \frac{6}{5}$@@$x = \frac{21}{26}$@@$x = \frac{9}{14}$@@$x = \frac{7}{24}$

下面的$\square$里可以填的最大整数是多少？
$\frac{9}{16} \times \frac{4}{5} ＜ \frac{9}{\square}$            $\frac{\square}{7} \times \frac{5}{6} ＜ \frac{6}{7}$              $\frac{7}{4} \times \frac{3}{4} ＜ \frac{7}{\square}$

答案： 19@@7@@5