《2025年口算训练六年级数学上册人教版双色升级版》

$0.5×\frac {1}{5}= $
$\frac {1}{6}×\frac {3}{4}= $
$\frac {5}{9}×\frac {4}{15}= $
$1.2×\frac {5}{6}= $
$\frac {3}{8}×4.8= $
$\frac {3}{4}×\frac {2}{7}= $
$9×\frac {5}{18}= $
$\frac {1}{2}×0.6= $
$5.4×\frac {5}{9}= $
$\frac {3}{8}×7.2= $
$5.5×\frac {3}{5}= $
$4.2×\frac {2}{7}= $
$2.4×\frac {1}{3}= $

答案： 解析：
这些题目都是基础的数学运算题目，主要考察的是分数、小数和整数的乘法运算。
对于分数与分数、分数与小数、分数与整数的乘法，我们需要掌握它们之间的换算和计算方法。
一般来说，我们可以直接将分数与分数相乘，得到新的分数；
对于分数与小数或整数的乘法，我们可以选择将分数或小数化为同一形式，然后进行相乘。
答案：
$0.5 × \frac{1}{5} = \frac{1}{2} × \frac{1}{5} = \frac{1}{10} = 0.1$
$\frac{1}{6} × \frac{3}{4} = \frac{1 × 3}{6 × 4} = \frac{3}{24} = \frac{1}{8}$
$\frac{5}{9} × \frac{4}{15} = \frac{5 × 4}{9 × 15} = \frac{20}{135} = \frac{4}{27}$
$1.2 × \frac{5}{6} = \frac{12}{10} × \frac{5}{6} = \frac{6}{5} × \frac{5}{6} = 1$
$\frac{3}{8} × 4.8 = \frac{3}{8} × \frac{48}{10} = \frac{3 × 48}{8 × 10} = 1.8$
$\frac{3}{4} × \frac{2}{7} = \frac{3 × 2}{4 × 7} = \frac{6}{28} = \frac{3}{14}$
$9 × \frac{5}{18} = \frac{9 × 5}{18} = \frac{45}{18} = 2.5$
$\frac{1}{2} × 0.6 = \frac{1}{2} × \frac{6}{10} = 0.3$
$5.4 × \frac{5}{9} = \frac{54}{10} × \frac{5}{9} = 3$
$\frac{3}{8} × 7.2 = \frac{3}{8} × \frac{72}{10} = 2.7$
$5.5 × \frac{3}{5} = \frac{55}{10} × \frac{3}{5} = 3.3$
$4.2 × \frac{2}{7} = \frac{42}{10} × \frac{2}{7} = 1.2$
$2.4 × \frac{1}{3} = \frac{24}{10} × \frac{1}{3} = 0.8$

$\frac {2}{5}÷4=$$\frac{1}{10}$
$\frac {4}{7}÷2=$$\frac{2}{7}$
$\frac {4}{15}÷3=$$\frac{4}{45}$
$\frac {3}{14}÷6=$$\frac{1}{28}$
$\frac {3}{7}÷15=$$\frac{1}{35}$
$\frac {9}{10}÷3=$$\frac{3}{10}$
$\frac {4}{5}÷4=$$\frac{1}{5}$
$\frac {8}{9}÷2=$$\frac{4}{9}$
$\frac {7}{12}÷21=$$\frac{1}{36}$
$\frac {10}{11}÷5=$$\frac{2}{11}$
$\frac {5}{7}÷15=$$\frac{1}{21}$
$\frac {3}{8}÷9=$$\frac{1}{24}$
$\frac {2}{13}÷4=$$\frac{1}{26}$

答案： 解析：这些题目都是分数除以整数的计算题。根据分数除法的运算法则，分数除以整数等于分数乘以这个整数的倒数。因此，我们需要将每个分数与对应的整数倒数相乘即可求出答案。
答案：
$\frac{2}{5} ÷ 4$
$= \frac{2}{5} × \frac{1}{4}$
$= \frac{2 × 1}{5 × 4}$
$= \frac{1}{10}$
$\frac{4}{7} ÷ 2$
$= \frac{4}{7} × \frac{1}{2}$
$= \frac{4 × 1}{7 × 2}$
$= \frac{2}{7}$
$\frac{4}{15} ÷ 3$
$= \frac{4}{15} × \frac{1}{3}$
$= \frac{4 × 1}{15 × 3}$
$= \frac{4}{45}$
$\frac{3}{14} ÷ 6$
$= \frac{3}{14} × \frac{1}{6}$
$= \frac{3 × 1}{14 × 6}$
$= \frac{1}{28}$
$\frac{3}{7} ÷ 15$
$= \frac{3}{7} × \frac{1}{15}$
$= \frac{3 × 1}{7 × 15}$
$= \frac{1}{35}$
$\frac{9}{10} ÷ 3$
$= \frac{9}{10} × \frac{1}{3}$
$= \frac{9 × 1}{10 × 3}$
$= \frac{3}{10}$
$\frac{4}{5} ÷ 4$
$= \frac{4}{5} × \frac{1}{4}$
$= \frac{4 × 1}{5 × 4}$
$= \frac{1}{5}$
$\frac{8}{9} ÷ 2$
$= \frac{8}{9} × \frac{1}{2}$
$= \frac{8 × 1}{9 × 2}$
$= \frac{4}{9}$
$\frac{7}{12} ÷ 21$
$= \frac{7}{12} × \frac{1}{21}$
$= \frac{7 × 1}{12 × 21}$
$= \frac{1}{36}$
$\frac{10}{11} ÷ 5$
$= \frac{10}{11} × \frac{1}{5}$
$= \frac{10 × 1}{11 × 5}$
$= \frac{2}{11}$
$\frac{5}{7} ÷ 15$
$= \frac{5}{7} × \frac{1}{15}$
$= \frac{5 × 1}{7 × 15}$
$= \frac{1}{21}$
$\frac{3}{8} ÷ 9$
$= \frac{3}{8} × \frac{1}{9}$
$= \frac{3 × 1}{8 × 9}$
$= \frac{1}{24}$
$\frac{2}{13} ÷ 4$
$= \frac{2}{13} × \frac{1}{4}$
$= \frac{2 × 1}{13 × 4}$
$= \frac{1}{26}$

$\frac {6}{7}÷6=$$\frac{1}{7}$
$\frac {7}{12}÷14=$$\frac{1}{24}$
$\frac {3}{4}÷6=$$\frac{1}{8}$
$\frac {5}{6}÷2=$$\frac{5}{12}$
$\frac {1}{6}÷6=$$\frac{1}{36}$
$\frac {5}{12}÷15=$$\frac{1}{36}$
$\frac {2}{3}÷6=$$\frac{1}{9}$
$\frac {7}{9}÷2=$$\frac{7}{18}$
$\frac {1}{2}÷8=$$\frac{1}{16}$
$\frac {2}{7}÷2=$$\frac{1}{7}$
$\frac {9}{14}÷3=$$\frac{3}{14}$
$\frac {2}{19}÷4=$$\frac{1}{38}$
$\frac {7}{45}÷14=$$\frac{1}{90}$

答案： 解析：
这些题目都是分数除法的口算题。分数除法的运算法则是将除数取反成为乘法，即“除以一个数等于乘以这个数的倒数”。
答案：
$\frac{6}{7} ÷ 6$
$= \frac{6}{7} × \frac{1}{6}$
$= \frac{1}{7}$
$\frac{7}{12} ÷ 14$
$= \frac{7}{12} × \frac{1}{14}$
$= \frac{1}{24}$
$\frac{3}{4} ÷ 6$
$= \frac{3}{4} × \frac{1}{6}$
$= \frac{1}{8}$
$\frac{5}{6} ÷ 2$
$= \frac{5}{6} × \frac{1}{2}$
$= \frac{5}{12}$
$\frac{1}{6} ÷ 6$
$= \frac{1}{6} × \frac{1}{6}$
$= \frac{1}{36}$
$\frac{5}{12} ÷ 15$
$= \frac{5}{12} × \frac{1}{15}$
$= \frac{1}{36}$
$\frac{2}{3} ÷ 6$
$= \frac{2}{3} × \frac{1}{6}$
$= \frac{1}{9}$
$\frac{7}{9} ÷ 2$
$= \frac{7}{9} × \frac{1}{2}$
$= \frac{7}{18}$
$\frac{1}{2} ÷ 8$
$= \frac{1}{2} × \frac{1}{8}$
$= \frac{1}{16}$
$\frac{2}{7} ÷ 2$
$= \frac{2}{7} × \frac{1}{2}$
$= \frac{1}{7}$
$\frac{9}{14} ÷ 3$
$= \frac{9}{14} × \frac{1}{3}$
$= \frac{3}{14}$
$\frac{2}{19} ÷ 4$
$= \frac{2}{19} × \frac{1}{4}$
$= \frac{1}{38}$
$\frac{7}{45} ÷ 14$
$= \frac{7}{45} × \frac{1}{14}$
$= \frac{1}{90}$