《2025年速算天地数学口算心算六年级上册苏教版》

$\frac{3}{5} × 0= $0
$\frac{5}{18} × \frac{3}{5}= $$\frac{1}{6}$
$\frac{3}{5} × \frac{5}{8}= $$\frac{3}{8}$
$\frac{4}{7} × \frac{35}{8}= $$\frac{5}{2}$
$\frac{1}{7} × \frac{14}{9}= $$\frac{2}{9}$
$1 × \frac{3}{81}= $$\frac{1}{27}$
$\frac{4}{27} × \frac{3}{8}= $$\frac{1}{18}$
$12 × \frac{3}{8}= $$\frac{9}{2}$
$240 × \frac{5}{8}= $150
$\frac{4}{13} × \frac{7}{8}= $$\frac{7}{26}$
$\frac{4}{17} × \frac{1}{8}= $$\frac{1}{34}$
$\frac{7}{16} × \frac{21}{21}= $$\frac{7}{16}$
$\frac{7}{12} × \frac{15}{14}= $$\frac{5}{8}$
$\frac{35}{6} × \frac{6}{7}= $5
$\frac{1}{9} × \frac{3}{19}= $$\frac{1}{57}$
$\frac{4}{17} × \frac{34}{3}= $$\frac{8}{3}$
$18 × \frac{5}{16}= $$\frac{45}{8}$
$13 × \frac{3}{13}= $3
$3 × \frac{3}{25}= $$\frac{9}{25}$
$8 × \frac{15}{8}= $15
$2 × \frac{3}{16}= $$\frac{3}{8}$
$\frac{4}{5} × 15= $12

答案： 解析：本题考查的知识点是分数乘法运算，包括分数与整数、分数与分数相乘。对于分数乘法，分数乘整数，用分数的分子和整数相乘的积做分子，分母不变；分数乘分数，用分子相乘的积做分子，分母相乘的积做分母，能约分的先约分再计算。
答案：
$\frac{3}{5}×0 = 0$
$\frac{5}{18}×\frac{3}{5}=\frac{5×3}{18×5}=\frac{1}{6}$
$\frac{3}{5}×\frac{5}{8}=\frac{3×5}{5×8}=\frac{3}{8}$
$\frac{4}{7}×\frac{35}{8}=\frac{4×35}{7×8}=\frac{5}{2}$
$\frac{1}{7}×\frac{14}{9}=\frac{1×14}{7×9}=\frac{2}{9}$
$1×\frac{3}{81}=\frac{3}{81}=\frac{1}{27}$
$\frac{4}{27}×\frac{3}{8}=\frac{4×3}{27×8}=\frac{1}{18}$
$12×\frac{3}{8}=\frac{12×3}{8}=\frac{9}{2}$
$240×\frac{5}{8}=\frac{240×5}{8}=150$
$\frac{4}{13}×\frac{7}{8}=\frac{4×7}{13×8}=\frac{7}{26}$
$\frac{4}{17}×\frac{1}{8}=\frac{4×1}{17×8}=\frac{1}{34}$
$\frac{7}{16}×\frac{21}{21}=\frac{7}{16}$
$\frac{7}{12}×\frac{15}{14}=\frac{7×15}{12×14}=\frac{5}{8}$
$\frac{35}{6}×\frac{6}{7}=\frac{35×6}{6×7}=5$
$\frac{1}{9}×\frac{3}{19}=\frac{1×3}{9×19}=\frac{1}{57}$
$\frac{4}{17}×\frac{34}{3}=\frac{4×34}{17×3}=\frac{8}{3}$
$18×\frac{5}{16}=\frac{18×5}{16}=\frac{45}{8}$
$13×\frac{3}{13}=3$
$3×\frac{3}{25}=\frac{3×3}{25}=\frac{9}{25}$
$8×\frac{15}{8}=15$
$2×\frac{3}{16}=\frac{2×3}{16}=\frac{3}{8}$
$\frac{4}{5}×15 = 12$