《2025年口算题卡升级练五年级上册青岛版54制》

1. 口算。
$\frac{1}{2} + \frac{1}{7} = $$\frac{9}{14}$
$\frac{1}{2} + \frac{3}{5} = $$\frac{11}{10}$
$\frac{3}{16} + \frac{3}{8} = $$\frac{9}{16}$
$\frac{7}{8} + \frac{2}{3} = $$\frac{37}{24}$
$\frac{1}{2} - \frac{1}{8} = $$\frac{3}{8}$
$\frac{5}{7} + \frac{2}{3} = $$\frac{29}{21}$
$\frac{5}{8} + \frac{3}{5} = $$\frac{49}{40}$
$\frac{17}{24} + \frac{1}{12} = $$\frac{19}{24}$
$\frac{5}{12} + \frac{2}{15} = $$\frac{29}{60}$
$\frac{2}{5} + \frac{3}{10} = $$\frac{7}{10}$
$\frac{2}{7} + \frac{5}{14} = $$\frac{9}{14}$
$\frac{5}{6} - \frac{2}{3} = $$\frac{1}{6}$
$\frac{7}{8} - \frac{2}{3} = $$\frac{5}{24}$
$\frac{7}{10} + \frac{1}{4} = $$\frac{19}{20}$
$\frac{11}{12} - \frac{5}{18} = $$\frac{23}{36}$
$\frac{7}{9} - \frac{1}{6} = $$\frac{11}{18}$

答案： $\frac{9}{14}$；$\frac{11}{10}$；$\frac{9}{16}$；$\frac{37}{24}$；$\frac{3}{8}$；$\frac{29}{21}$；$\frac{49}{40}$；$\frac{19}{24}$；$\frac{29}{60}$；$\frac{7}{10}$；$\frac{9}{14}$；$\frac{1}{6}$；$\frac{5}{24}$；$\frac{19}{20}$；$\frac{23}{36}$；$\frac{11}{18}$

2. 填一填。
$\frac{3}{5} + \frac{1}{6}$　$1 - \frac{2}{7}$　$\frac{1}{4} + \frac{1}{6}$　$\frac{5}{6} - \frac{2}{15}$

得数小于$\frac{1}{2}$ ______
得数大于$\frac{1}{2}$ ______

答案： 解析：本题考查异分母分数加减法及分数大小比较。需要先计算出各个算式的结果，再将结果与$\frac{1}{2}$比较大小。
$\frac{3}{5} + \frac{1}{6}$
$=\frac{18}{30} + \frac{5}{30}$
$=\frac{23}{30}$
$\frac{23}{30}＞\frac{1}{2}$
$1 - \frac{2}{7}=\frac{5}{7}$
$\frac{5}{7}＞\frac{1}{2}$
$\frac{1}{4} + \frac{1}{6}$
$=\frac{3}{12} + \frac{2}{12}$
$=\frac{5}{12}$
$\frac{5}{12}＜\frac{1}{2}$
$\frac{5}{6} - \frac{2}{15}$
$=\frac{25}{30} - \frac{4}{30}$
$=\frac{21}{30}=\frac{7}{10}$
$\frac{7}{10}＞\frac{1}{2}$
得数小于$\frac{1}{2}$：$\frac{1}{4} + \frac{1}{6}$；
得数大于$\frac{1}{2}$：$\frac{3}{5} + \frac{1}{6}$，$1 - \frac{2}{7}$，$\frac{5}{6} - \frac{2}{15}$。

3. 解方程。
$\frac{5}{4} + x = \frac{7}{3}$ ______
$\frac{3}{5} - x = \frac{1}{3}$ ______
$\frac{1}{9} + x = \frac{1}{4}$ ______
$\frac{5}{6} + x = \frac{7}{8}$ ______
$\frac{7}{12} - x = \frac{1}{2}$ ______
$\frac{5}{18} + x = \frac{13}{24}$ ______

答案： $\frac{5}{4} + x = \frac{7}{3}$
解：$x = \frac{7}{3} - \frac{5}{4}$
$x = \frac{28}{12} - \frac{15}{12}$
$x = \frac{13}{12}$
$\frac{3}{5} - x = \frac{1}{3}$
解：$x = \frac{3}{5} - \frac{1}{3}$
$x = \frac{9}{15} - \frac{5}{15}$
$x = \frac{4}{15}$
$\frac{1}{9} + x = \frac{1}{4}$
解：$x = \frac{1}{4} - \frac{1}{9}$
$x = \frac{9}{36} - \frac{4}{36}$
$x = \frac{5}{36}$
$\frac{5}{6} + x = \frac{7}{8}$
解：$x = \frac{7}{8} - \frac{5}{6}$
$x = \frac{21}{24} - \frac{20}{24}$
$x = \frac{1}{24}$
$\frac{7}{12} - x = \frac{1}{2}$
解：$x = \frac{7}{12} - \frac{1}{2}$
$x = \frac{7}{12} - \frac{6}{12}$
$x = \frac{1}{12}$
$\frac{5}{18} + x = \frac{13}{24}$
解：$x = \frac{13}{24} - \frac{5}{18}$
$x = \frac{39}{72} - \frac{20}{72}$
$x = \frac{19}{72}$