《2025年口算基础训练六年级数学上册人教版》

$9× \frac{2}{3}= $6
$3.9× \frac{4}{13}= $1.2
$\frac{1}{2}+\frac{5}{12}= $$\frac{11}{12}$
$\frac{3}{20}× \frac{7}{18}= $$\frac{7}{120}$
$\frac{1}{5}× \frac{5}{12}= $$\frac{1}{12}$
$\frac{8}{75}× \frac{3}{4}= $$\frac{2}{25}$
$\frac{4}{13}× \frac{1}{8}= $$\frac{1}{26}$
$\frac{3}{20}× \frac{1}{6}= $$\frac{1}{40}$
$\frac{9}{11}× 5.5= $4.5
$\frac{25}{4}× \frac{1}{5}= $$\frac{5}{4}$
$\frac{33}{40}× \frac{4}{11}= $$\frac{3}{10}$
$125× \frac{3}{25}= $15
$5.6× \frac{1}{8}= $0.7
$27× \frac{5}{9}= $15
$\frac{2}{9}× 9.9= $2.2
$4.5× \frac{2}{3}= $3
$\frac{5}{14}× \frac{1}{4}= $$\frac{5}{56}$
$\frac{8}{9}× \frac{1}{2}= $$\frac{4}{9}$
$\frac{11}{23}× \frac{1}{3}= $$\frac{11}{69}$
$7.2× \frac{5}{8}= $4.5
$\frac{3}{7}× \frac{1}{2}= $$\frac{3}{14}$
$\frac{11}{12}× 6= $5.5
$\frac{17}{50}× \frac{2}{3}= $$\frac{17}{75}$
$\frac{1}{4}× \frac{1}{2}= $$\frac{1}{8}$

答案： 解析：
这些题目都是基础的数学运算题目，主要考察的是乘法、加法和分数的计算。
对于乘法题目，我们可以直接将两个数相乘得出结果。
对于加法题目，我们需要找到两个分数的最小公倍数，然后进行相加。
答案：
$9 × \frac{2}{3} = 6$
$3.9 × \frac{4}{13} = 1.2$
$\frac{1}{2} + \frac{5}{12} = \frac{6}{12} + \frac{5}{12} = \frac{11}{12}$
$\frac{3}{20} × \frac{7}{18} = \frac{7}{120}$
$\frac{1}{5} × \frac{5}{12} = \frac{1}{12}$
$\frac{8}{75} × \frac{3}{4} = \frac{2}{25}$
$\frac{4}{13} × \frac{1}{8} = \frac{1}{26}$
$\frac{3}{20} × \frac{1}{6} = \frac{1}{40}$
$\frac{9}{11} × 5.5 = 4.5$
$\frac{25}{4} × \frac{1}{5} = \frac{5}{4}$
$\frac{33}{40} × \frac{4}{11} = \frac{3}{10}$
$125 × \frac{3}{25} = 15$
$5.6 × \frac{1}{8} = 0.7$
$27 × \frac{5}{9} = 15$
$\frac{2}{9} × 9.9 = 2.2$
$4.5 × \frac{2}{3} = 3$
$\frac{5}{14} × \frac{1}{4} = \frac{5}{56}$
$\frac{8}{9} × \frac{1}{2} = \frac{4}{9}$
$\frac{11}{23} × \frac{1}{3} = \frac{11}{69}$
$7.2 × \frac{5}{8} = 4.5$
$\frac{3}{7} × \frac{1}{2} = \frac{3}{14}$
$\frac{11}{12} × 6 = \frac{11}{2} = 5.5$
$\frac{17}{50} × \frac{2}{3} = \frac{17}{75}$
$\frac{1}{4} × \frac{1}{2} = \frac{1}{8}$