《2025年口算训练六年级数学上册人教版双色升级版》

$\frac {5}{6}×60= $
$80×\frac {1}{2}= $
$\frac {8}{9}×30= $
$5×\frac {8}{15}= $
$\frac {5}{12}×20= $
$27×\frac {8}{9}= $
$\frac {3}{14}×\frac {2}{5}= $
$\frac {2}{3}×\frac {5}{16}= $
$\frac {8}{15}×\frac {5}{16}= $
$\frac {7}{80}×\frac {4}{7}= $
$\frac {3}{8}×\frac {16}{21}= $
$72×\frac {5}{18}= $
$\frac {5}{13}×\frac {26}{75}= $

答案： 分析：
这些题目都是分数与整数的乘法运算，或者是两个分数的乘法运算。
对于分数与整数的乘法，我们可以直接将整数与分子相乘，然后除以分母。
对于两个分数的乘法，我们可以直接将两个分数的分子相乘得到新的分子，两个分数的分母相乘得到新的分母。
答案：
1. $\frac {5}{6}×60 = 50$
2. $80×\frac {1}{2} = 40$
3. $\frac {8}{9}×30 = \frac {80}{3}$ (或写作 $26\frac {2}{3}$)
4. $5×\frac {8}{15} = \frac {8}{3}$ (或写作 $2\frac {2}{3}$)
5. $\frac {5}{12}×20 = \frac {25}{3}$ (或写作 $8\frac {1}{3}$)
6. $27×\frac {8}{9} = 24$
7. $\frac {3}{14}×\frac {2}{5} = \frac {3}{35}$
8. $\frac {2}{3}×\frac {5}{16} = \frac {5}{24}$
9. $\frac {8}{15}×\frac {5}{16} = \frac {1}{6}$
10. $\frac {7}{80}×\frac {4}{7} = \frac {1}{20}$
11. $\frac {3}{8}×\frac {16}{21} = \frac {2}{7}$
12. $72×\frac {5}{18} = 20$
13. $\frac {5}{13}×\frac {26}{75} = \frac {2}{15}$

$\frac {1}{20}×\frac {2}{3}=$$\frac{1}{30}$
$\frac {3}{4}×\frac {2}{15}=$$\frac{1}{10}$
$\frac {3}{5}×\frac {1}{15}=$$\frac{1}{25}$
$\frac {7}{40}×\frac {5}{7}=$$\frac{1}{8}$
$\frac {2}{45}×\frac {3}{11}=$$\frac{2}{165}$
$\frac {3}{14}×\frac {2}{3}=$$\frac{1}{7}$
$\frac {2}{15}×\frac {1}{18}=$$\frac{1}{135}$
$\frac {3}{8}×\frac {5}{6}=$$\frac{5}{16}$
$\frac {20}{21}×\frac {3}{4}=$$\frac{5}{7}$
$\frac {7}{20}×\frac {5}{14}=$$\frac{1}{8}$
$\frac {5}{18}×\frac {9}{20}=$$\frac{1}{8}$
$\frac {3}{16}×\frac {8}{9}=$$\frac{1}{6}$
$\frac {17}{50}×\frac {2}{17}=$$\frac{1}{25}$

答案： 分析：
这些题目都是关于分数的乘法运算。分数乘法的一般步骤是：直接将两个分数的分子相乘得到新的分子，将两个分数的分母相乘得到新的分母，然后尽可能化简结果。
答案：
1. $\frac{1}{20} × \frac{2}{3} = \frac{1 × 2}{20 × 3} = \frac{2}{60} = \frac{1}{30}$
2. $\frac{3}{4} × \frac{2}{15} = \frac{3 × 2}{4 × 15} = \frac{6}{60} = \frac{1}{10}$
3. $\frac{3}{5} × \frac{1}{15} = \frac{3 × 1}{5 × 15} = \frac{3}{75} = \frac{1}{25}$
4. $\frac{7}{40} × \frac{5}{7} = \frac{7 × 5}{40 × 7} = \frac{35}{280} = \frac{1}{8}$
5. $\frac{2}{45} × \frac{3}{11} = \frac{2 × 3}{45 × 11} = \frac{6}{495} = \frac{2}{165}$
6. $\frac{3}{14} × \frac{2}{3} = \frac{3 × 2}{14 × 3} = \frac{6}{42} = \frac{1}{7}$
7. $\frac{2}{15} × \frac{1}{18} = \frac{2 × 1}{15 × 18} = \frac{2}{270} = \frac{1}{135}$
8. $\frac{3}{8} × \frac{5}{6} = \frac{3 × 5}{8 × 6} = \frac{15}{48} = \frac{5}{16}$
9. $\frac{20}{21} × \frac{3}{4} = \frac{20 × 3}{21 × 4} = \frac{60}{84} = \frac{5}{7}$
10. $\frac{7}{20} × \frac{5}{14} = \frac{7 × 5}{20 × 14} = \frac{35}{280} = \frac{1}{8}$
11. $\frac{5}{18} × \frac{9}{20} = \frac{5 × 9}{18 × 20} = \frac{45}{360} = \frac{1}{8}$
12. $\frac{3}{16} × \frac{8}{9} = \frac{3 × 8}{16 × 9} = \frac{24}{144} = \frac{1}{6}$
13. $\frac{17}{50} × \frac{2}{17} = \frac{17 × 2}{50 × 17} = \frac{34}{850} = \frac{1}{25}$

$\frac {4}{3}×\frac {3}{8}=$$\frac{1}{2}$
$\frac {3}{4}×\frac {5}{6}=$$\frac{5}{8}$
$\frac {5}{9}×9=$5
$\frac {5}{6}×\frac {9}{10}=$$\frac{3}{4}$
$\frac {4}{15}×\frac {3}{8}=$$\frac{1}{10}$
$\frac {4}{5}×5=$4
$2×\frac {1}{3}=$$\frac{2}{3}$
$\frac {9}{11}×\frac {5}{9}=$$\frac{5}{11}$
$8×\frac {5}{8}=$5
$9×\frac {2}{15}=$$\frac{6}{5}$（或$1\frac{1}{5}$）
$\frac {4}{7}×28=$16
$\frac {3}{7}×7=$3
$\frac {9}{16}×48=$27

答案： 分析：
这些题目都是关于分数乘法的口算题，需要直接计算出结果。
答案：
$\frac {4}{3}×\frac {3}{8}= \frac{1}{2}$
$\frac {3}{4}×\frac {5}{6}= \frac{5}{8}$
$\frac {5}{9}×9= 5$
$\frac {5}{6}×\frac {9}{10}= \frac{3}{4}$
$\frac {4}{15}×\frac {3}{8}= \frac{1}{10}$
$\frac {4}{5}×5= 4$
$2×\frac {1}{3}= \frac{2}{3}$
$\frac {9}{11}×\frac {5}{9}= \frac{5}{11}$
$8×\frac {5}{8}= 5$
$9×\frac {2}{15}= \frac{6}{5}$（或$1\frac{1}{5}$）
$\frac {4}{7}×28= 16$
$\frac {3}{7}×7= 3$
$\frac {9}{16}×48= 27$