《2025年速算天地数学口算心算六年级上册苏教版》

$\frac{1}{4} × 2= $$\frac{1}{2}$
$\frac{5}{9} × 3= $$\frac{5}{3}$
$\frac{5}{9} × 6= $$\frac{10}{3}$
$\frac{3}{20} × 15= $$\frac{9}{4}$
$57 × \frac{3}{19}= $9
$7 × \frac{3}{21}= $1
$\frac{4}{5} × 5= $4
$5 × \frac{2}{15}= $$\frac{2}{3}$
$\frac{2}{9} × 2= $$\frac{4}{9}$
$\frac{2}{5} × 15= $6
$\frac{9}{14} × 7= $$\frac{9}{2}$
$\frac{3}{5} × 10= $6
$1 × \frac{3}{8}= $$\frac{3}{8}$
$\frac{8}{9} × 0= $0
$\frac{8}{9} × 6= $$\frac{16}{3}$
$\frac{5}{8} × 12= $$\frac{15}{2}$
$27 × \frac{5}{18}= $$\frac{15}{2}$
$\frac{7}{12} × 7= $$\frac{49}{12}$
$\frac{11}{15} × 2= $$\frac{22}{15}$
$\frac{25}{33} × 11= $$\frac{25}{3}$

答案： 解析：这些题目都是基础的分数乘法口算题，主要考查分数乘法的运算规则，即分子乘分子，分母乘分母，能约分的先约分。
答案：
$\frac{1}{4} × 2 = \frac{1 × 2}{4} = \frac{1}{2}$
$\frac{5}{9} × 3 = \frac{5 × 3}{9} = \frac{5}{3}$
$\frac{5}{9} × 6 = \frac{5 × 6}{9} = \frac{10}{3}$
$\frac{3}{20} × 15 = \frac{3 × 15}{20} = \frac{9}{4}$
$57 × \frac{3}{19} = \frac{57 × 3}{19} = 9$
$7 × \frac{3}{21} = \frac{7 × 3}{21} = 1$
$\frac{4}{5} × 5 = \frac{4 × 5}{5} = 4$
$5 × \frac{2}{15} = \frac{5 × 2}{15} = \frac{2}{3}$
$\frac{2}{9} × 2 = \frac{2 × 2}{9} = \frac{4}{9}$
$\frac{2}{5} × 15 = \frac{2 × 15}{5} = 6$
$\frac{9}{14} × 7 = \frac{9 × 7}{14} = \frac{9}{2}$
$\frac{3}{5} × 10 = \frac{3 × 10}{5} = 6$
$1 × \frac{3}{8} = \frac{3}{8}$
$\frac{8}{9} × 0 = 0$
$\frac{8}{9} × 6 = \frac{8 × 6}{9} = \frac{16}{3}$
$\frac{5}{8} × 12 = \frac{5 × 12}{8} = \frac{15}{2}$
$27 × \frac{5}{18} = \frac{27 × 5}{18} = \frac{15}{2}$
$\frac{7}{12} × 7 = \frac{7 × 7}{12} = \frac{49}{12}$
$\frac{11}{15} × 2 = \frac{11 × 2}{15} = \frac{22}{15}$
$\frac{25}{33} × 11 = \frac{25 × 11}{33} = \frac{25}{3}$