《2025年口算题卡升级练五年级上册青岛版54制》

① $\frac{5}{12} × \frac{3}{5} ÷ \frac{1}{2} = \frac{5}{12} ×$$\frac{3}{5}$$×$$2$$=$$\frac{1}{2}$
② $\frac{11}{24} ÷ \frac{22}{27} × \frac{2}{3} = \frac{11}{24} ×$$\frac{27}{22}$$×$$\frac{2}{3}$$=$$\frac{3}{8}$
③ $\frac{7}{8} ÷ \frac{7}{16} ÷ \frac{3}{10} = \frac{7}{8} ×$$\frac{16}{7}$$×$$\frac{10}{3}$$=$$\frac{20}{3}$

答案： 解析：
这些题目主要考察分数的乘除运算。在进行分数的乘除运算时，可以将除法转换为乘法，即“除以一个数等于乘以这个数的倒数”。
答案：
① $\frac{5}{12} × \frac{3}{5} ÷ \frac{1}{2} = \frac{5}{12} × \frac{3}{5} × 2 = \frac{1}{2}$
所以填空处为：$\frac{3}{5}$，$2$，$\frac{1}{2}$
② $\frac{11}{24} ÷ \frac{22}{27} × \frac{2}{3} = \frac{11}{24} × \frac{27}{22} × \frac{2}{3} = \frac{3}{8}$
所以填空处为：$\frac{27}{22}$，$\frac{2}{3}$，$\frac{3}{8}$
③ $\frac{7}{8} ÷ \frac{7}{16} ÷ \frac{3}{10} = \frac{7}{8} × \frac{16}{7} × \frac{10}{3} = \frac{20}{3}$
所以填空处为：$\frac{16}{7}$，$\frac{10}{3}$，$\frac{20}{3}$

脱式计算。
$\frac{8}{9} × \frac{4}{5} × \frac{9}{10}$______
$\frac{1}{4} × \frac{3}{5} × \frac{5}{6}$______
$\frac{2}{15} × \frac{5}{9} × 6$______
$\frac{25}{7} × \frac{2}{5} × \frac{2}{5}$______
$\frac{1}{2} × \frac{1}{9} × \frac{3}{5}$______
$49 ÷ \frac{7}{9} ÷ 7$______

答案： $\frac{8}{9} × \frac{4}{5} × \frac{9}{10}$
$=\frac{8}{9}×\frac{9}{10}×\frac{4}{5}$
$=\frac{8}{10}×\frac{4}{5}$
$=\frac{4}{5}×\frac{4}{5}$
$=\frac{16}{25}$
$\frac{1}{4} × \frac{3}{5} × \frac{5}{6}$
$=\frac{1}{4}×(\frac{3}{5}×\frac{5}{6})$
$=\frac{1}{4}×\frac{1}{2}$
$=\frac{1}{8}$
$\frac{2}{15} × \frac{5}{9} × 6$
$=\frac{2}{27}×6$
$=\frac{12}{27}$
$=\frac{4}{9}$
$\frac{25}{7} × \frac{2}{5} × \frac{2}{5}$
$=\frac{10}{7}×\frac{2}{5}$
$=\frac{4}{7}$
$\frac{1}{2} × \frac{1}{9} × \frac{3}{5}$
$=\frac{1}{18}×\frac{3}{5}$
$=\frac{1}{30}$
$49 ÷ \frac{7}{9} ÷ 7$
$=49×\frac{9}{7}÷7$
$=63÷7$
$=9$

解方程。
$\frac{4}{3}x = \frac{4}{5}$______
$\frac{15}{14}x = \frac{7}{5}$______
$12x × \frac{1}{4} = \frac{19}{20}$______
$\frac{3}{7}x = 18$______
$x ÷ \frac{2}{9} = \frac{8}{21}$______
$8x - \frac{1}{6} = \frac{13}{6}$______

答案： $\frac{4}{3}x = \frac{4}{5}$
解：$x = \frac{4}{5} ÷ \frac{4}{3}$
$x = \frac{4}{5} × \frac{3}{4}$
$x = \frac{3}{5}$
$\frac{15}{14}x = \frac{7}{5}$
解：$x = \frac{7}{5} ÷ \frac{15}{14}$
$x = \frac{7}{5} × \frac{14}{15}$
$x = \frac{98}{75}$
$12x × \frac{1}{4} = \frac{19}{20}$
解：$3x = \frac{19}{20}$
$x = \frac{19}{20} ÷ 3$
$x = \frac{19}{20} × \frac{1}{3}$
$x = \frac{19}{60}$
$\frac{3}{7}x = 18$
解：$x = 18 ÷ \frac{3}{7}$
$x = 18 × \frac{7}{3}$
$x = 42$
$x ÷ \frac{2}{9} = \frac{8}{21}$
解：$x = \frac{8}{21} × \frac{2}{9}$
$x = \frac{16}{189}$
$8x - \frac{1}{6} = \frac{13}{6}$
解：$8x = \frac{13}{6} + \frac{1}{6}$
$8x = \frac{14}{6}$
$8x = \frac{7}{3}$
$x = \frac{7}{3} ÷ 8$
$x = \frac{7}{3} × \frac{1}{8}$
$x = \frac{7}{24}$