《2025年速算天地数学口算心算六年级上册苏教版》

速算 8
$\frac{3}{10} × 20 = $6
$\frac{3}{16} × \frac{8}{21} = $$\frac{1}{14}$
$15 × \frac{3}{5} = $9
$\frac{35}{6} × \frac{12}{7} = $10
$14 × \frac{11}{21} = $$\frac{22}{3}$
$\frac{4}{17} × \frac{34}{8} = $1
$\frac{4}{5} × \frac{15}{7} = $$\frac{12}{7}$
$\frac{6}{17} × \frac{3}{8} = $$\frac{9}{68}$
$\frac{3}{4} × \frac{8}{9} = $$\frac{2}{3}$
$320 × \frac{5}{8} = $200
$\frac{4}{11} × 2 = $$\frac{8}{11}$
$\frac{7}{18} × 6 = $$\frac{7}{3}$
$\frac{1}{6} × 4 = $$\frac{2}{3}$
$25 × \frac{3}{5} = $15
$5 × \frac{2}{15} = $$\frac{2}{3}$
$\frac{3}{4} × \frac{2}{3} = $$\frac{1}{2}$
$\frac{4}{5} × \frac{5}{6} = $$\frac{2}{3}$
$\frac{8}{15} × \frac{5}{16} = $$\frac{1}{6}$
$64 × \frac{9}{32} = $18
$\frac{7}{22} × \frac{11}{14} = $$\frac{1}{4}$
$\frac{4}{35} × \frac{7}{8} = $$\frac{1}{10}$
$\frac{25}{49} × \frac{7}{5} = $$\frac{5}{7}$

答案： 解析：这些题目都是基础的分数乘法速算题。
需要直接计算出每个表达式的结果。
答案：
$\frac{3}{10} × 20 = 6$，
$\frac{3}{16} × \frac{8}{21} = \frac{1}{14}$，
$15 × \frac{3}{5} = 9$，
$\frac{35}{6} × \frac{12}{7} = 10$，
$14 × \frac{11}{21} = \frac{22}{3}$，
$\frac{4}{17} × \frac{34}{8} = 1$，
$\frac{4}{5} × \frac{15}{7} = \frac{12}{7}$，
$\frac{6}{17} × \frac{3}{8} = \frac{9}{68}$，
$\frac{3}{4} × \frac{8}{9} = \frac{2}{3}$，
$320 × \frac{5}{8} = 200$，
$\frac{4}{11} × 2 = \frac{8}{11}$，
$\frac{7}{18} × 6 = \frac{7}{3}$，
$\frac{1}{6} × 4 = \frac{2}{3}$，
$25 × \frac{3}{5} = 15$，
$5 × \frac{2}{15} = \frac{2}{3}$，
$\frac{3}{4} × \frac{2}{3} = \frac{1}{2}$，
$\frac{4}{5} × \frac{5}{6} = \frac{2}{3}$，
$\frac{8}{15} × \frac{5}{16} = \frac{1}{6}$，
$64 × \frac{9}{32} = 18$，
$\frac{7}{22} × \frac{11}{14} = \frac{1}{4}$，
$\frac{4}{35} × \frac{7}{8} = \frac{1}{10}$，
$\frac{25}{49} × \frac{7}{5} = \frac{5}{7}$。