《2025年阳光同学计算小达人五年级数学下册冀教版》

3. 解方程。
$x+\frac{5}{7}=\frac{20}{21}$ $x+\frac{1}{5}=\frac{17}{25}$ $x-\frac{1}{2}=\frac{3}{5}$
$x-\frac{1}{6}=4$ $x+\frac{2}{5}=\frac{3}{7}$ $x+\frac{5}{8}=\frac{2}{3}$

答案： $x = \frac{5}{21}$@@$x = \frac{12}{25}$@@$x = \frac{11}{10}$@@$x = 4\frac{1}{6}$@@$x = \frac{1}{35}$@@$x = \frac{1}{24}$

4. 计算下面各题，能简算的要简算。
$\frac{1}{6}+\frac{5}{6}\times\frac{4}{9}$ $\frac{10}{9}\times\frac{7}{15}\times\frac{12}{35}$ $\frac{34}{35}\times36-\frac{34}{35}$
$(\frac{1}{7}+\frac{3}{8})\times\frac{14}{9}$ $\frac{17}{13}\times\frac{26}{51}\times\frac{3}{4}$ $(\frac{4}{5}-\frac{1}{4})\times(\frac{1}{11}+\frac{5}{22})$
$(\frac{3}{4}-\frac{2}{3})\times\frac{6}{7}$ $(\frac{5}{6}-\frac{3}{4}+\frac{1}{3})\times48$ $\frac{14}{45}\times22 + 14\times\frac{23}{45}$
$53\times\frac{4}{27}$ $\frac{16}{5}\times\frac{2}{3}+\frac{1}{5}\times\frac{16}{3}$ $\frac{1}{4}\times\frac{1}{15}+\frac{2}{5}\times\frac{1}{4}+\frac{8}{15}\times\frac{1}{4}$

答案： $\frac{29}{54}$@@$\frac{8}{45}$@@34@@$\frac{29}{36}$@@$\frac{1}{2}$@@$\frac{7}{40}$@@$\frac{1}{14}$@@20@@14@@$7\frac{23}{27}$@@$3\frac{1}{5}$@@$\frac{1}{4}$